All of the following are respiratory structures associated with the exchange of gases EXCEPT
a. the tracheal system.
b. lungs.
c. gills.
d. villi.
D
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Which of the following statements about
digestion in ruminants is false? a. Ruminant animals have symbiotic bacteria to aid in the digestion of their food. b. Food materials are re-chewed. c. Chewing results in mechanically breaking down food and exposing more cellulose to digestive enzymes. d. Ruminants have a smaller range of foods in their diet than do humans. e. Pronghorn antelopes and other herbivores have a single but disproportionately large stomach.
A feature that only mammals have is:
a. predatory behavior. b. internal skeleton. c. bilateral symmetry. d. a skeleton of calcium carbonate. e. hair.
Blood vessels that can expand and contract contain a lot of collagen as a structural extracellular matrix protein.
Answer the following statement true (T) or false (F)
A hormone released in the small intestine that stimulates the pancreas to release digestive enzymes and the gallbladder to release bile is known as ________
A) cholecystokinin B) secretin C) gastrin D) vasoactive intestinal peptide