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110 Cards in this Set
- Front
- Back
What are 5 functions of the respiratory system?
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1) provides extensive gas exchange surface area between air and circulating blood
2) moves air to and from exchange surfaces of lungs 3) protects respiratory surfaces from outside environment 4) produces sounds 5) participates in olfactory sense |
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What is in the upper respiratory tract?
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-nostrils
-nasal passagees -paranasal sinuses -pharynx -larynx |
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What is in the lower respiratory tract?
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-trachea
-bronchi -bronchioles -alveolar ducts -alveoli |
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What are the two portions of the respiratory tract?
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-conducting portion
*from nasal cavity to terminal bronchioles -respiratory portion *respiratory bronchioles and alveoli |
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Where is the respiratory mucous membrane?
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-lines conducting portion of respiratory system
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What does the respiratory mucous memrane consist of?
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-an epithelial layer
-an areolar layer |
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How does the epithelial layer of mucous membrane change?
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-goes from pseudostratified ciliated columnar epithelium to a very delicate simple squamous epithelium
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What are responsible for producing mucus?
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-goblet cells
-mucous glands |
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What is cilia for?
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-sweep debris trapped in mucus toward the pharynx
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What is the purpose of filtration in respiration?
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-to remove large particles
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What do alveolar macrophages do?
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-engulf small particles that reach lungs
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What part does the nost play in respiration?
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-air enters through nostrils (external nares)
-air into nasal vestibule -air goes through nasal hairs in the nasal vestibule as first particle filtration system -air goes from vestibule to internal nares |
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What divides the nasal cavity into left and right parts?
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-nasal septum
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What must the air pass through to get from external to internal nares?
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-superior meatus
-middle meatus -inferior meatus |
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What happens as air passes through the three meatus' and why?
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-turbulence for:
-warming and humidifying incoming air -trapping particles |
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What clean and moisten the nasal cavity?
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-mucous secretions from paranasal sinus
-tears |
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Where and what is the olfactory region?
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-superior portion of nasal cavity
-provides sense of smell |
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What/where is the hard palate?
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-forms floor of nasal cavity
-separates nasal and oral cavities |
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What/where is the soft palate?
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-extends posterior to hard palate
-divides superior nasopharynx from lower pharynx |
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Where do the digestive and respiratory systems meet?
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-pharynx
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Where is the pharynx located?
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-extends from the internal nares to entrances to the larynx and esophagus
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What are the divisions of the pharynx?
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-nasopharynx (superior)
-oropharynx (middle) -laryngopharynx (inferior) *extends from hyoid bone to entrance of larynx and esophagus |
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After air leaves pharynx, where does the air go?
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-through glottis
-into larynx |
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What is the larynx?
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-cartilaginous structure that surrounds the glottis
-composed of three large cartilages adn three smaller pairs of cartilages |
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What is the epiglottis?
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-prevents entry of food and liquids into respiratory tract
-when swallowing, larynx is elevated and epiglottis folds back over glottis |
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What are the two pairs of folds that span the glottis?
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-the inelastic vestibular folds
-more delicate vocal folds |
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How is sound produced?
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-air passes through the glottis vibrates the vocal folds producing sound
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Where is the trachea located?
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-extends from the larynx to the primary bronchi
*posterior tracheal wall can distort to permit large masses of food to pass through the esophagus |
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What does the trachea look like?
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-contains C-shaped tracheal cartilages
-stiffen the tracheal walls and protect the airway |
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What does the trachea divide into?
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-left and right primary bronchi which enter each lung
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How is the bronchial tree formed?
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-primary bronchi branches apart
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How does the cartilage change as bronchi branch (and smooth muscle)?
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-decreases and smooth muscle increases
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What are the two functions of the lung?
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-air distribution
-gas exchange |
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What are the parts of the lung?
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-hilus
-base -apex -convex lateral surface |
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What is the hilus of the lung?
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-where pulmonary nerves, blood vessels, and lymphatics enter lung
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What is the base of the lung?
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-inferior portion of each lung rests on superior surface of diaphragm
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What seperates the lobes of each lung?
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-fissures
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What are the lobes of the right lung?
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-cranial
-caudal -middle *sometimes a small accessory lobe |
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What are the lobes of the left lung?
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-cranial
-caudal |
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What is special about horse lungs?
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-they are unlobed
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What are the branching bronchial tree?
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-primary bronchus branches to form secondary bronchi
-secondary bronchi branch to form tertiary bronchi -tertiary bronchus branches into multiple bronchioles -bronchioles branch into terminal bronchioles |
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Where do each secondary bronchi go?
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-into each lobe
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What are tertiary bronchi known as?
What do they do? How many are in each lung? |
-segmental bronchi
-supplies air to a single bronchopulmonary segment -8 to 10 segments in each lung in human |
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What are bronchioles made of?
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-no cartilage
-dominated by smooth muscle |
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What controls diameter of bronchioles and airflow/ resistance in lungs?
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-autonomic control regulates smooth muscle, bronchioles are dominated by smooth muscle
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What are the smallest compartments of the lung?
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-pulmonary lobules
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How does blood enter and exit pulmonary lobules?
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-arteriole
-venuole |
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What connects respiratory bronchioles to alveoli?
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-alveolar ducts
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Finally, what do terminal bronchioles split into (in lobules)?
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-respiratory bronchioles
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What are alveolus?
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-air filled pockets within the lungs where all gas exchange takes place
-a capillary network surrounds each alveolus -surrounded by elastic fibers |
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What is alveolar epithelium?
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-consists of simple squamous epithelium
-contains septal cells that produce surfactant -patrolled by alveolar macrophages |
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What does the respiratory membrane do?
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-the thin membrane of alveoli where gas exchange takes place
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What are the three parts of the respiratory membrane?
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-squamous epithelial lining of alveolus
-endothelial cells lining an adjacent capillary -fused basal laminae between alveolar and endothelial cells |
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Why is gas diffusion very rapid across respiratory membrane?
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-because distance is small
-gases (oxygen and CO2) are lipid soluble |
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What is the circuit called which supplies blood to the lungs?
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-pulmonary circuit
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Where to the pulmonary arteries enter the lungs?
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-at the hilus and branch with the bronchi
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Where does the oxygenated blood from the alveolar capillaries go?
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-pass through pulmonary venules
-enters pulmonary veins -delivered into left atrium |
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What separates the 2 pleural cavities?
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-mediastinum
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What does each pleural cavity hold?
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-holds a lung
-lined with a serous membrane (the pleura) |
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What are the two layers of the serous cavity?
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-parietal pleura
-visceral pleura |
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What lubricates the space between the two pleura?
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-pleural fluid
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What is external respiration?
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-the exchange of oxygen and carbon dioxide in the lungs
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What does external respiration include?
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-pulmonary ventilation
-gas diffusion across the respiratory membrane -transport of oxygen and carbon dioxide in the blood |
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What is internal respiration?
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-the exchange of oxygen and carbon dioxide between blood and tissue cells
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What is pulmonary ventilation?
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-the physical movement of air into and out of the respiratory tract (inspiration and expiration)
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What is Boyle's law?
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-as pressure on a gas decreases, its volume expands
-as pressure increases, gas volume contracts (P=1/V) |
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What is normal atmospheric pressure?
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-at sea level, it's about 760mm Hg
-mm Hg is millimeters of mercury |
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What is compliance?
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-ability of pulmonary tissues to stretch, making inspiration possible
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What are the mechanisms of pulmonary ventilation?
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-air flows from area of higher pressure to area of lower pressure
-relationship between intrapulmonary and atmospheric pressure determines the direction of air flow |
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What is intrapulmonary pressure?
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-pressure measured inside the respiratory tract, at the alveoli
-on inhalation: -1 mm Hg -on exhalation: +1 mm Hg |
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What is intrapleural pressure?
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-pressure measured in the space between the parietal and vesceral pleura
- -4mm Hg to -18 mm Hg |
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What are the most important respiratory muscles?
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-the diaphragm
-external intracostal muscles of the ribs -accessory respiratory muscles |
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What are the accessory respiratory muscles?
*When are these activated |
-internal intercostal
-pectoralis minor -rectus abdominis muscles -activated when respiration increases significantly |
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What are the modes of breathing?
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-quiet breathing
-forced breathing |
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What is quiet breathing?
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-eupnea
-involves active inhalation and passive exhalation -involves the diaphragm and the external and internal intercostal muscles |
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What is forced breathing?
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-hyperpnea
-involves active inhalation and exhalation -assisted by accessory muscles |
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What is the instrument used to measure volume of air?
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-spirometer
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What are the 4 pulmonary volumes?
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1) Tidal volume
2) expiratory reserve volume 3) inspiratory reserve volume 4) resudual volume |
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What are the 4 calculated respiratory capacities?
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1) inspiratory capacity
2) functional residual capacity 3) vital capacity 4) total lung capacity |
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What is tidal volume?
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-amount of air moving into or out of the lung furing a single respiratory cycle
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What is expiratory reserve volume?
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-largest volume of additional air can be forcibly exhaled
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What is inspiratory reserve volume?
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-amount of air that can be forcibly inhaled after normal inspiration
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What is residual volume?
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-amount of air that cannot be forcibly exhaled
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What is inspiratory capacity?
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-tidal volume + inspiratory reserve volume
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What is functional residual capacity?
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-the amoun tof air at the end of a normal respiration
-expiratory reserve volume + residual volume |
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What is vital capacity?
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-the sum of IRV + TV + ERV
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What is total lung capacity?
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-the total amount of air a lung can hold
-vital capacity + resudual volume |
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Where does gas exchange occur?
*What does it depend on? |
-occurs between blood and alveolar air
-occurs across the respiratory membrane -depends on partial pressures of the gases, and diffusion of molecules between gas and liquid |
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What is partial pressure?
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-the pressure contributed by each gas in teh atmosphere
-all partial pressures add up to 760 mm Hg |
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What is Henry's Law?
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-The amoun tof a gas in solution is directly proportional to the partial pressure of that gas
-the actual amount of a gas in solution at a given partial pressure and temperature depends on teh solubility of the gas in that particular liquid |
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Where is blood flow greatest?
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-coordinated with air flow
-greatest around alveoli with highest P02 values |
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Under normal conditions, equilibrium exists between what in respiration?
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-absorption of oxygen and generation of carbon dioxide in peripheral cells
-the capillary rates of delivery and removal -oxygen absorption and carbon dioxide excretion at the lungs |
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What homeostatic mechanisms occur if equilibrium becomes unbalanced in respiration?
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-changes in blood flow and oxygen delivery that are regulated at the local level
-changes in teh depth and rate of respiration under the control of the brain's respiratory centers |
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Where are the respiratory centers located in the brain?
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-pons and medulla oblongata
- |
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What are the respiratory centers in the pons called?
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-apneustic
-pneumotaxic centers |
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Where are the respiratory rhythmicity centers located and what do they do?
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-medulla oblongata
-set the pace of respiration |
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What 2 groups can the rhythmicity centers be divided into?
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-dorsal respiratory group
-ventral respiratory group |
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What is the dorsal respiratory group do?
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-inspiratory center
-functions in quiet and forced breathing |
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What is the ventral respiratory group?
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-inspiratory and expiratory center
-functions only in forced breathing |
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What do the apneustic and pneumotaxic centers of the Pons do?
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-adjust output of respiratory rhythmicity centers
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What does the apneustic center do?
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-stimulates the inspiratory center to increase the length and depth of inspiration
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What does the pneumotaxic center do?
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-inhibits the apneustic center and inspiratory center to prevent overinflation of the lungs
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What are three respiratory reflexes?
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1) chemoreceptor reflexes
2) baroreceptor reflexes 3)Hering-Breuer reflexes |
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What are chemoreceptors sensitive to?
*What does this lead to? |
-P CO2, P O2, pH
-blood or cerebrospinal fluid *leads to increased depth and rate of respiration |
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Describe barareceptor reflexes.
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-carotid and aortic barareceptor stimulation affects blood pressure and respiratory centers
-when blood pressure falls, respiration increases -when blood pressure increases, respiration decreases |
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What are 2 baroreceptor reflexes involved in forced breathing?
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-inflation reflex
-deflation reflex |
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What does the inflation reflex do in the Hering-Breuer reflexes?
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-prevents overexpansion of lungs
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What does the deflation reflex do in the Hering-Breuer reflexes?
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-inhibits expiratory centers
-stimulates inspiratory centers during lung deflation |
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What are the primary dirvers of respiratory activity?
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-CO2 levels, not O2 levels!
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Input from what three things cause modification of basic pace of respiration.
*Where does this occur? |
-chemoreceptors, baroreceptors, stretch receptors
-basic pace of respiration established between respiratory centers in the pons and medulla oblongata |