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18 Cards in this Set
- Front
- Back
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What is the function of the Respiratory System?
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To acquire oxygen from the atmosphere & remove excess CO2 from the body
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What is the Cardio-Pulmonary system?
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The ♡ and the lungs working closely w/one another
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What are the components of the upper respiratory tract?
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•Mouth
•Nasopharynx •Oropharynx •Laryngopharynx •Larynx |
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What is the function of the Respiratory membrane?
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Where the exchange of gases in the lungs (external respiration) takes place
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What is the Respiratory membrane made of?
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Alveolar wall and the capillary wall fused firmly together
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What happens to the ribs when breathing in?
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•Move outwards when pulled upwards
•Enlarges the thoracic cavity •Intercostal muscles stimulated to contract by the intercostal nerves |
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How does the chest change in size during inspiration?
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•External intercostal muscles CONTRACT
•Chest EXPANDS •Diaphragm CONTRACTS |
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What happens to the chest size during expiration?
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•External intercostal muscles RELAX
•Chest RECOILS •Diaphragm RELAXES |
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What cavities does the Diaphragm separate?
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Thoracic & abdominal
(forms the floor of the thoracic cavity & the roof of the abdominal cavity) |
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How is respiration controlled?
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Chemoreceptors
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What are Chemoreceptors?
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Receptors that respond to changes in partial pressures of O2 & CO2 in the blood cerebrospinal fluid
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How is breathing controlled?
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•CO2 = main stimulus
•Increased conc. of CO2 alters pH of blood = more acidic •Stimulates chemoreceptors in blood vessels/brain stem •Sensory nervous impulses relayed to Respiratory Centre in brain stem (medulla oblongata) •Responds by sending 'motor' impulses back to muscles associated w/breathing to increase rate/depth •Removes CO2 |
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What is the function of the pharynx?
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•Passageway for:
food air •Resonating chamber for speech |
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What arte the divisions of the Pharynx?
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Nasopharynx
Oropharynx Laryngopharynx |
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What is the passage way of air?
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Pharynx, Larynx, Trachea, Bronchi, Bronchioles
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What happens to air as it travels over the moist mucosa?
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Becomes saturated w/water vapour
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What is the Mucociliary escalator?
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SYNCHRONOUS & REGULAR BEATING of the cilia of the mucous membrane
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What are the functions of the upper airway?
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Filtering, warming & humidifying of inspired air
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