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In the nephron, the fluid that immediately precedes urine is known as:

A.

renal filtrate

B.

tubular fluid

C.

plasma

D.

glomerular filtrate

Answer and Explanation

The Correct Answer is B

A. Renal filtrate refers to the fluid filtered from the blood in the glomerulus, which is the initial stage of urine formation. It does not immediately precede urine. 

 

B. Tubular fluid is the filtrate as it passes through the nephron tubules, undergoing various processes like reabsorption and secretion. This fluid eventually becomes urine, after the final adjustments in the collecting duct.

 

C. Plasma is the liquid component of blood that is filtered by the glomerulus, but it is not the direct precursor to urine. 

 

D. Glomerular filtrate is the fluid filtered out of the blood in the glomerulus and is the precursor to tubular fluid, not directly to urine.


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View Related questions

Correct Answer is C

Explanation

A. Cutaneous transpiration: While cutaneous transpiration (evaporation of sweat from the skin) contributes to water loss, it is not the primary mechanism controlling water output.

B. Drinking: Drinking affects water intake rather than output. It does not directly control how much water is excreted from the body.

C. Urine volume: Urine volume is the primary means by which the body regulates water output. The kidneys adjust urine volume to maintain fluid balance and homeostasis.

D. Sweating: Sweating contributes to water loss but is not the primary mechanism for controlling overall water output compared to urine production.

Correct Answer is B

Explanation

A. It stimulates angiotensin II secretion: Antidiuretic hormone (ADH) does not directly stimulate angiotensin II secretion; instead, it acts on the kidneys to promote water reabsorption.

B. It promotes water conservation: ADH promotes water conservation by increasing water reabsorption in the kidneys, reducing urine output, and thus helping to maintain fluid balance.

C. It inhibits salivation and thirst: ADH does not inhibit salivation or thirst; in fact, it can increase thirst to encourage fluid intake when dehydration is detected.

D. It stimulates hypothalamic osmoreceptors: While ADH affects hypothalamic osmoreceptors indirectly by promoting water retention, its primary function is to act on the kidneys to conserve water.

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