THORAX ABDOMEN AND PELVIS

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MEDICAL

KIDNEY

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
Which of the following are true of the Loop of Henle’s role in osmoregulation?I. The ascending limb is impermeable to waterII. The descending limb is impermeable to Na+III. It creates a hypotonic region in the medulla
A
I and II only
B
I and III only
C
II and III only
D
I, II and III
Explanation: 

Detailed explanation-1: -The loop of Henle acts as a countercurrent multiplier that uses energy to create concentration gradients. The descending limb is water permeable. Water flows from the filtrate to the interstitial fluid, so osmolality inside the limb increases as it descends into the renal medulla.

Detailed explanation-2: -Osmoregulation occurs in the medulla of the kidney and involves two key events: The loop of Henle establishes a salt gradient (hypertonicity) in the medulla. Anti-diuretic hormone (ADH) regulates the level of water reabsorption in the collecting duct.

Detailed explanation-3: -Its main function is to reabsorb water and sodium chloride from the filtrate. This conserves water for the organism, producing highly concentrated urine.

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