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Based on their function, where would you expect to find microvilli to be in the body?

A.

Fallopian tubes

B.

Digestive tract

C.

Urinary tract

D.

Respiratory tract

Answer and Explanation

The Correct Answer is B

A. Fallopian tubes: The Fallopian tubes have cilia, not microvilli. Cilia help move the egg toward the uterus.

B. Digestive tract: Microvilli are found on the epithelial cells of the small intestine. They increase the surface area for maximum nutrient absorption.

C. Urinary tract: While some absorptive and secretory functions occur in the nephron, microvilli are not prominent structures throughout the urinary tract.

D. Respiratory tract: The respiratory tract is lined with ciliated epithelium, which helps move mucus, not with microvilli for absorption.


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Related Questions

Correct Answer is B

Explanation

A. Nothing, it's just a pass through to the next structure: The stomach plays a critical role in digestion through mixing and secretion of gastric juices.

B. Gastric juices mix with the food and the stomach muscles squeeze it: This process forms chyme through mechanical (squeezing) and chemical (acid/enzymes) digestion.

C. The food moves quickly into the small intestine: Food stays in the stomach for a period of time for processing before gradually passing into the small intestine.

D. The food is completely digested and is absorbed by tiny blood vessels in the walls of the stomach: Most digestion and nutrient absorption occur in the small intestine, not the stomach.

Correct Answer is A

Explanation

A. Decreases the reabsorption of water: Most diuretics act by preventing the reabsorption of sodium and water in the nephron, increasing urine output.

B. Decreases GFR (glomerular filtration rate): Diuretics do not usually decrease GFR; some may slightly increase or maintain it.

C. Activates the renin-angiotensin-aldosterone system: Diuretics often reduce blood volume, which might trigger RAAS as a compensatory mechanism, but activation of RAAS is not the drug’s direct action.

D. Causes the release of ADH: Diuretics counteract the action of ADH by promoting diuresis.

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