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

Most water that enters the gut is absorbed across the lining of the ___________ . a. stomach b. small intestine c. large intestine d. esophagus

Match each organ with a digestive function. a. makes bile b. compacts undigested residues c. secretes enzymes, bicarbonate d. absorbs most nutrients e. secretes gastric fluid f. stores, secretes bile __________gallbladder __________large intestine __________liver __________small intestine __________stomach __________pancreas

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

Can vitamin C be stored in body fat?

Iron is an example of a ________ . 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 d

Filtration moves _________ into kidney tubules. a. water b. fiber c. proteins d. all of the above

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

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

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. a. stores urine b. delivers urine to body surface c. carries urine from kidney to bladder d. secretes ADH e. many inside a kidney ureter bladder urethra nephron pituitary gland