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Chapter 41 - Animal Nutrition
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40
Biology
12th Grade
03/19/2012

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Term
essential nutrients
Definition
materials that must be obtained in preassembled form as cells cannot synthesize them
Term
malnourishment
Definition
animal whose diet is missing 1 or more essential nutrients
Term
vitamins
Definition
organic molecules required in the diet in small quantities
Term
minerals
Definition
simple, inorganic nutrients
Term
ingestion
Definition
act of eating
Term
digestion
Definition
process of breaking down food into molecules small enough to be eaten by body
Term
enzymatic hydrolysis
Definition
digestion breaks bonds with the addition of water, hydrolytic enzymes catalyze digestion of food
Term
absorption
Definition
cells take up amino acids and sugars from digestion
Term
elimination
Definition
undigested material passes out of the digestive compartment
Term
intracellular digestion
Definition
breakdown of food by simple digestive compartments in cells without digesting the cell's cytoplasm
Term
extracellular digestion
Definition
breakdown of food outside of cells
Term
gastrovascular cavities
Definition
digestive sacs with simple openings
Term
persistalsis
Definition
rhythmic waves of contraction by smooth muscles in the walls of the canal, pushes food along
Term
Sphincters
Definition
muscular ring-like valves, regulate the passage of material between specialized chambers of the canal
Term
Accessory glands
Definition
salivary glands, pancreas, liver, gallbladder
Term
mucin
Definition
in saliva, protects mouth and lubricates food
Term
salivary amylase
Definition
an enzyme that hydrolyzes starch and glycogen into smaller polysaccharides and the disaccharide maltose
Term
bolus
Definition
ball of food shaped by chewing that is shaped to enter the pharynx
Term
pharynx
Definition
throat
Term
epiglottis
Definition
cartilaginous flap that prevents food from entering windpipe
Term
glottis
Definition
opening of the trachea
Term
esophagus
Definition
brings food from pharynx to stomach via peristalsis
Term
stomach
Definition
located in upper abdominal cavity under diaphragm
Term
gastric juice
Definition
secreted by stomach, mixes with food and kills most bacteria, can digest most food
Term
pepsin
Definition
enzyme that starts hydrolysis of proteins
Term
pepsinogen
Definition
inactive form of pepsin
Term
acid chyme
Definition
nutrient broth produced by enzymes and mixing of the swallowed food in stomach
Term
pyloric sphincter
Definition
regulates passage of chyme to intestine
Term
small intestine
Definition
longest section of alimentary canal, 6m long
Term
duodenum
Definition
first part of small intestine where chyme mixes with other digestive juices
Term
liver
Definition
produces bile, which is stored in the gallbladder
Term
villi
Definition
large, circular folds that line the intestinal epithelium
Term
lacteal
Definition
single vessel of the lymphatic system inside villi
Term
chylomicrons
Definition
globules that transport fats out of the intestine to other parts of the body
Term
hepatic portal vein
Definition
capillaries and veins that drain nutrients away from the villi converge here
Term
cecum
Definition
part of the colon, a pouch
Term
appendix
Definition
fingerlike extension of the cecum, makes minor contribution to body defense
Term
colon
Definition
recovers water that has entered the alimentary canal as the solvent to various digestive juices
Term
feces
Definition
digestive wastes that become more solid as they are moved along the colon by peristalsis
Term
rectum
Definition
where feces are stored until they can be expelled from the body
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