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All the following are functions of the digestive system except:

A.

Break down ingested foods

B.

Digest ingested foods to release nutrients

C.

Production of red blood cells

D.

Excretion of waste products

Answer and Explanation

The Correct Answer is C

A. Break down ingested foods: The digestive system performs mechanical and chemical breakdown (e.g., chewing, enzymes) of ingested food.
B. Digest ingested foods to release nutrients: Digestion (chemical breakdown) releases absorbable nutrients (amino acids, monosaccharides, fatty acids).
C. Production of red blood cells: Hematopoiesis (production of RBCs) occurs mainly in bone marrow (and in fetal life the liver/spleen), not as a function of the digestive tract.
D. Excretion of waste products: The digestive system eliminates undigested material and some metabolic wastes as feces.


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Related Questions

Correct Answer is A

Explanation

A. Cervix:The narrow, tubular, inferior portion (“neck”) of the uterus that protrudes into the vagina; it contains the external os.

B. Perimetrium:The outer serosal covering of the uterus (visceral peritoneum); not a tube and doesn’t project into the vagina.

C. Vestibule:The external genital space between the labia minora with the urethral and vaginal openings; not part of the uterus.

D. External os:Merely the opening of the cervix into the vagina—not the entire projecting tubular structure.

Correct Answer is D

Explanation

A. Microvilli:Microvilli are tiny apical membrane projections that greatly increase surface area for absorption (mainly in the small intestine), not responsible for stomach expansion.
B. Plica circularis:Plicae circularis (circular folds) are permanent folds of the small intestine mucosa that aid absorption, not found in the stomach.
C. Haustra:Haustra are sacculations of the large intestine (colon), not structures of the stomach.
D. Rugae:Rugae are the longitudinal mucosal folds in the stomach wall that allow the stomach to stretch and expand as it fills .

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