Nokea
Which of the given enzymes is responsible for the digestion of milk protein?
- A. Erepsin
- B. Trypsin
- C. Pepsin
- D. Rennin
Correct Answer: D
Rationale: Rennin is responsible for the digestion of milk protein. Rennin is present in the human body in its inactive form called prorenin. When we consume milk, it reacts with the hydrochloric acid present in the stomach. Hydrochloric acid activates the inert prorenin and converts it into active Rennin.
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How many pairs of salivary glands produce saliva, which contains amylase to start digestion of dietary starch?
- A. Two
- B. Three
- C. Four
- D. Five
Correct Answer: B
Rationale: Humans have three pairs of salivary glands (parotid, submandibular, sublingual) that produce saliva containing amylase; not five as originally asserted.
(Gustatory) sensory cells of taste buds, all true except:
- A. They have pale cytoplasm and darkly stained oval nuclei.
- B. Their apical surfaces contain long microvilli embedded in amorphous glycosaminoglycan material secreted by supporting cells
- C. Are peripheral in position
- D. Their basal parts are connected to the afferent nerve fibers.
Correct Answer: C
Rationale: Gustatory cells are centrally located within the taste bud, surrounded by supporting cells, not peripheral.
Amino acids are absorbed in-
- A. Blood capillaries of villi
- B. Wall of rectum
- C. Lacteals and blood capillaries of villi
- D. Lacteals of villi
Correct Answer: A
Rationale: Amino acids are absorbed into the blood capillaries of the villi in the small intestine.
Match each term with the correct description: filtering units of kidney
- A. urethra
- B. nephrons
- C. bladder
- D. kidneys
Correct Answer: B
Rationale: Nephrons are the filtering units within the kidneys.
Chemical digestion of carbohydrates begins in the........... whereas chemical digestion of proteins begins in the...........
- A. Oral cavity; duodenum
- B. Stomach; oral cavity
- C. Stomach; duodenum
- D. Oral cavity; Stomach
Correct Answer: D
Rationale: Carbohydrate digestion starts in the oral cavity with salivary amylase, while protein digestion begins in the stomach with pepsin.