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The capillaries and lymphatics that transport nutrients absorbed across the wall of the GI organs lie in the

A.

Muscularis

B.

Mucosal epithelium

C.

Serosa

D.

Lamina propria

Answer and Explanation

The Correct Answer is D

A. Muscularis: The muscularis is the smooth muscle layer responsible for peristalsis/segmentation; it contains muscle, not the primary capillary/lymphatic beds for nutrient absorption.
B. Mucosal epithelium: The epithelial layer faces the lumen and absorbs nutrients at the cell surface, but the transport capillaries/lymphatics lie deeper than the epithelium.
C. Serosa: The serosa is the outer connective tissue covering of the gut -it does not contain the nutrient capillaries and lacteals.
D. Lamina propria: The lamina propria (a connective tissue layer within the mucosa) contains blood capillaries and lymphatic lacteals that transport absorbed nutrients.


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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. The exocrine function involves hormone release, while the endocrine function involves the secretion of buffers and enzymes.:this reverses the roles; exocrine does enzymes/buffers, endocrine does hormones.
B. The endocrine function involves the secretion of digestive enzymes, while the exocrine function involves hormone release.: reversed roles.
C. The exocrine function involves the release of insulin and glucagon, while the endocrine function involves hormone release.: insulin and glucagon are endocrine products, not exocrine.
D. The endocrine function involves the release of insulin and glucagon, while the exocrine function involves the secretion of digestive enzymes and buffers.: the pancreas’ islet cells secrete insulin/glucagon (endocrine) and acinar/bicarbonate secretions go to the duodenum (exocrine).

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