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63 Cards in this Set

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