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63 Cards in this Set
- Front
- Back
What glands produce saliva?
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Parotid (anterior to ears), Submandibualar, Sublingual
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What are the endocrine products of the pancreas?
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Insulin, Glucagons
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What is bile composed of?
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Bile salts, Bile pigment (mostly bilirubin from the breakdown of hemoglobin), Cholesterol, Phospholipids, Electrolytes.
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What does the gallbladder store?
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Bile
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What is segmentation?
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Moving materials back & forth to aid in mixing (in digestive system)
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What are the processes of mechanical digestion?
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Mixing of food in the mouth by the tongue, Churning of food in the stomach, Segmentation in the sm intestine.
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What are carbohydrates broken down to?
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Simple sugars.
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What are proteins broken down to?
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Amino acids.
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What are fats broken down to?
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Fatty acids & alchols.
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What are the stimuli that control digestive activity?
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Stretch of the organ, pH of the contents, Presence of the breakdown products.
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What are the reflexes that control digestive activity?
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Activation or inhibition of glandular secretions, Smooth muscle activity.
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Salivary amylase breaks down starch into?
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Maltose
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What are the phases of deglutition (swallowing)?
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Buccal phase (in the mouth), Pharyngeal-esophageal phase.
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Which passageways are blocted to the stomach & how?
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Tongue blocks off the mouth.
Soft palate (uvula) blocks the nasopharynx. Epiglottis blocks the larynx. |
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What factors regulate gastric juice?
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Neural & Hormonal
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What causes the release of gastrin?
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Presence of food or falling pH.
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What does gastrin cause stomach glands to produce?
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Protein-digesting enzymes.
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What enzymes digest protein?
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Pepsin & Rennin
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What does the stomach absorb?
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Alcohol & ASA
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What do enzymes from the brush border do?
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Break double sugars into simple sugars.
Complete some protein digestion. |
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What is the action of pancreatic enzymes?
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Amylase helps complete digestion of starch, Digests about half of proteins (trypsin,etc), Lipase is responsible for fat digestion, Nucleases digest ducleic acids, Alkaline contents neutralizes acidic chyme.
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What nerve stimulates the release of pancreatic juice?
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Vagus
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What hormones stimulates the release of pancreatic juice?
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Secretin
Cholecystokinin |
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How are lipids absorbed?
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diffusion
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What is absorbed in the lg intestine?
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Water & vitamins K & B
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What is catabolism?
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Substances are broken down to simpler substances. Energy is released.
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What is anabolism?
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Larger molecules are built form smaller ones,
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What is the major breakdown product & fuel to make ATP?
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Glucose
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What is glycolysis?
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Energiszes a glucose molecule so that it can be split into two pyruvic acid molecules & yield ATP.
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What does the Krebs cycle produce?
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Virtually all the CO2 & H2O resulting from cell respiration, yields a sm amt of ATP.
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For ATP synthesis fats must first be broken down to?
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Acetic acid.
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Within the mitochondira, acetic acid is completely oxidized to produce?
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Water, CO2, & ATP
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Proteins are conserved by body cells because?
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They are used for most cellular structures.
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Ingested proteins are broken down to?
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Amino acids.
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Cells remove amino acids to build?
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Proteins.
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Amino acids are used to make ATP only when?
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Proteinsa are overabundant or there is a shortage of other sources.
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Amine groups are removed from proteins as?
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Amonia
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The liver converts harmful ammonia to?
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Urea which can be eliminated in urine.
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What are the liver's roles in digestion?
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Detoxifies drugs & ETOH, Degrades hormones, Produce cholesterol, blood proteins, Plays a central role in metabolism.
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What is Glycogenesis?
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Glucose molecules are converted to glycogen (glycogen molecules are stored in the liver)
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What is Glycogenolysis?
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Glucose is released from the liver after conversion from glycogen.
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What is Gluconeogenesis?
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Glucose is produced from fats & proteins.
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Fats & fatty acids that are picked up by the liver are?
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Some are oxidized to provide energy for liver cells.
Rest are broken down into simpler compunds & released into the blood. |
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What are the functions of cholesterol?
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Serves as a structural basis of steroid hormones & vit D.
Is a major buliding block of plasma membranes. |
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Where does most cholesterol come from?
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Produced in the liver, not the diet.
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Can cholesterol & fatty acids circulate freely in the bloodstream?
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No
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What form is energy stored in?
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Fat or Glycogen
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What mechanisms may regulate food intake?
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Levels of nutrients in the blood, Hormones, Body temp, Psychological factors.
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What is Basic Metabolic Rate?
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Amount of heat produced by the body per unit of time at rest.
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What factors influence BMR?
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Surface area (sm body usually has higher BMR), Gender (males have higher BMR), Age (peds & adolescents have Higher BMR), Amt of thyroxine (most important factor)
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Most energy is released as foods are?
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Oxidized
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What are the layers of the alimentary canal organs?
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Mucosa, Submucosa, Muscularis externa, Serosa.
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What are the 3 separate networks of nerve fibers of the alimentary canal nerve plexuses?
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Submucosal nerve plexus
Myenteric nerve plexus Subserous plexus |
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Lesser omentum attaches the liver to the? (of the stomach)
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lesser curvature.
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Greater omentum attaches the posterior body wall to the? (of the stomach)
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Greater curvature
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*Specialized mucosa of the stomach*
Mucous neck cells produce? |
A sticky alkaline mucus.
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*Specialized mucosa of the stomach*
Gastric glands secrete? |
Gastric juice
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*Specialized mucosa of the stomach*
Chief cells produce? |
Protein-digesting enzymes (pepsinogens)
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*Specialized mucosa of the stomach*
Parietal cells produce? |
Hydrochloric acid
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*Specialized mucosa of the stomach*
Endocrine cells produce? |
Gastrin
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What is the body's major digestive organ?
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Small Intestine.
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What are the pocket like sacs/walls of the lg intestine?
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Haustra
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In the lg intestine smooth muscle is reduced to?
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3 bands, Teniae coli.
Muscle bands have some degree of tone. |