Chapter 23

A digestive system functions in ___________. a. secreting enzymes b. absorbing nutrients c. eliminating wastes d. all of the above

Protein digestion begins in the _________. a. mouth b. stomach c. small intestine d. colon

Digestion is completed and most nutrients are absorbed in the __________. a. mouth b. stomach c. small intestine d. colon

Bile has roles in ___________ digestion and absorption. a. carbohydrate b. fat c. protein d. amino acid

Bacteria that produce vitamin \(B_{12}\) live in the __________. a. stomach b. small intestine c. large intestine d. esophagus

Match each organ with a digestive function. ________gallbladder ________large ________intestine ________liver ________small intestine ________stomach ________pancreas a. makes bile, stores glycogen b. compacts undigested residues c. secretes enzymes, buffer d. absorbs most nutrients e. secretes gastric fluid f. stores, secretes bile

Essential fatty acids are __________. a. trans fats c. vitamins b. saturated fats d. not made by the body

Microvilli ____________. a. increase the surface area of the stomach b. are the main type of cell in the lining of the small intestine c. project from the surface of cells in the small intestine d. produce bile

Iron is an example of \(a(n)\) ___________. a. vitamin b. mineral c. essential fatty acid d. essential amino acid

Urea forms as a breakdown product of _________. a. nucleic acids b. simple sugars c. saturated fats d. proteins e. complex carbohydrates f. a through

Filtration moves __________ and other substances into kidney tubules. a. water b. fiber c. proteins d. red blood cells

Water loss triggers a(n) __________ in ADH secretion. a. increase b. decrease

13\. Kidneys return water and small solutes to the blood by the process of ________. a. filtration b. reabsorption c. tubular secretion d. both a and b

14\. Kidneys adjust the blood acidity by increasing or decreasing the of ___________ \(\mathrm{H}^{+}\) a. filtration b. reabsorption c. secretion d. both a and b

Match each structure with a function. _____ureter _____bladder _____urethra _____nephron _____pituitary gland a. stores urine b. delivers urine to body surface c. carries urine from kidney to bladder d. secretes ADH e. many inside a kidney