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Glomerular filtration pressure is caused by:

A.

Pressure within the renal tubules

B.

Blood pressure

C.

Intrathoracic pressure

D.

Intraabdominal pressure

Answer and Explanation

The Correct Answer is B

A. Pressure within the renal tubules: This is tubular pressure, which opposes filtration and is not the driving force.

B. Blood pressure: Blood pressure within the glomerular capillaries provides the main hydrostatic pressure driving glomerular filtration.

C. Intrathoracic pressure: This affects respiration and venous return, not glomerular filtration.

D. Intraabdominal pressure: Elevated intraabdominal pressure can impair renal perfusion, but it does not drive filtration.


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Related Questions

Correct Answer is B

Explanation

A. Stores undigested pieces of food: The stomach, not the esophagus, is responsible for storing food temporarily.

B. Transports food from the pharynx to the stomach: The esophagus is a muscular tube that uses peristalsis to move food from the pharynx to the stomach.

C. Absorbs nutrients: Nutrient absorption occurs mainly in the small intestine, not the esophagus.

D. Breaks down proteins: Protein digestion begins in the stomach via pepsin, not in the esophagus.

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.

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