ECOLOGY
EXCRETORY PRODUCTS AND THEIR ELIMINATION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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are not affected by high levels of nitrogenous wastes
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have plasma membranes of low permeability to water
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are not in contact with interstitial fluid
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are the largest epithelial cells in the body
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Detailed explanation-1: -The thick ascending limb of Henle’s loop actively reabsorbs sodium chloride (NaCl) but is impermeable to water.
Detailed explanation-2: -The thin limbs (descending and ascending) are lined by simple squamous epithelium. The thin descending loop is highly permeable to water (which is easily transferred to the interstitium) and less permeable to solutes. On the other hand, the thin ascending limb is highly permeable to sodium but impermeable to water.
Detailed explanation-3: -The best answer for this one is that their membranes are impermeable to water.
Detailed explanation-4: -Thick ascending limb Sodium (Na+), potassium (K+) and chloride (Cl−) ions are reabsorbed by active transport. The predominant mechanism of active transport in this segment is through the Na+/K+/Cl− co-transporter NKCC2 as well as the sodium/hydrogen exchanger NHE3.