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The outermost layer of the digestive tract, which is composed of a thin layer of areola tissue:

A.

mucosa (mucous membrane)

B.

serosa (mesentery)

C.

muscularis externa

D.

submucosa

Answer and Explanation

The Correct Answer is B

A. Mucosa (mucous membrane): The mucosa is the innermost layer of the digestive tract, not the outermost. It includes the epithelium, lamina propria, and muscularis mucosae.

B. Serosa (mesentery): The serosa is the outermost layer of the digestive tract in parts where it is covered by peritoneum. It consists of a thin layer of areolar tissue topped by simple squamous epithelium.

C. Muscularis externa: The muscularis externa is a layer of muscle in the digestive tract, located beneath the serosa. It is not the outermost layer.

D. Submucosa: The submucosa is a layer of connective tissue located between the mucosa and muscularis externa. It is not the outermost layer.


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Related Questions

Correct Answer is B

Explanation

A. Wastes; nutrients and oxygen: Wastes pass from the fetal blood to the maternal blood, and nutrients and oxygen pass from the maternal blood to the fetal blood.

B. Oxygen and nutrients; wastes: Oxygen and nutrients pass from maternal blood to fetal blood, and wastes pass from fetal blood to maternal blood.

C. Wastes and nutrients; oxygen and carbon dioxide: Nutrients and oxygen pass from maternal to fetal blood, while wastes and carbon dioxide pass from fetal to maternal blood. This option is incorrect because it lists wastes and nutrients incorrectly.

D. Carbon dioxide; nutrients: Carbon dioxide and other wastes pass from fetal to maternal blood, while nutrients pass from maternal to fetal blood.

Correct Answer is B

Explanation

A. Pyelitis is an infection of the renal pelvis and does not cause sweet-smelling urine.

B. Diabetes mellitus often causes glycosuria (glucose in urine), which can make urine taste sweet.

C. Renal calculus (kidney stones) does not affect urine sweetness.

D. Acute glomerulonephritis affects kidney function and urine appearance but does not specifically cause sweet-smelling urine.

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