The kidney\'s distal convoluted tube: A) reabsorbs water B) maintains homeostasi

Question

The kidney's distal convoluted tube: A) reabsorbs water B) maintains homeostasis C) regulates ion levels D) produces leucocytes E) reabsorbes alcohol The Loop of Henle functions because its descending loop encounters salinity and its ascending loop lacks A) increasing; active transport B) decreasing; ADH C) increasing; ADH D) decreasing; aquaporins E) increasing; aquaporins Which is not an example of a negative feedback loop? A) the release of glucagon B) the release of insulin C) release of oxytocin during birth D) release of ADH E) All of the above

Explanation / Answer

c) regulates ion levels.

Note: distal convoluted tubule of kidney regulates ion levels by reabsorbing sodium ions and secreting potassium ions. DCT also maintains pH by reabsorbing other ions ( such as calcium ) and secreting H+ ions.

E) Increasing salinity, ; aquaporins.

The descending loop of Henle encounters an increasing salinity level , and the ascending loop is impermeable to water because it lacks aquaporins (channels for water transport ).

c) release of oxytocin during birth.

All other hormones mentioned above in question except oxytocin are regulated by negative feedback loop.

Oxytocin is regulated by a positive feedback loop during birth. Release of oxytocin induces release of more oxytocin (a positive regulation ).

Ans 1

c) regulates ion levels.

Note: distal convoluted tubule of kidney regulates ion levels by reabsorbing sodium ions and secreting potassium ions. DCT also maintains pH by reabsorbing other ions ( such as calcium ) and secreting H+ ions.

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