ANIMAL PHYSIOLOGY
OSMOREGULATION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Permeable to Na
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Permeable to water
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Permeable to glucose
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permeable to amino acid
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Detailed explanation-1: -1) Ascending limb of loop of Henle is impermeable to electrolytes, but is permeable to water.
Detailed explanation-2: -The thin ascending limb is impermeable to water, but it is permeable to ions. Sodium (Na+), potassium (K+) and chloride (Cl−) ions are reabsorbed from the urine by secondary active transport by a Na-K-Cl cotransporter (NKCC2).
Detailed explanation-3: -Permeability is largely dependent on the concentration of Aquaporin 1 in the epithelium. The descending thin loop is a primary site of water absorption. In contrast, the ascending loop is permeable to ions rather than water.
Detailed explanation-4: -The thin ascending limb is impermeable to water and ions, except sodium and chloride, which cross by diffusion. In thick ascending limb, sodium (Na), potassium (K) and chloride (Cl) ions are reabsorbed by active transport.
Detailed explanation-5: -This segment is fundamentally impermeable to water, moderately permeable to urea, and highly permeable to Na+ and Cl-.