EXCRETORY SYSTEM
KIDNEY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Removing urea from the blood
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Producing urine at a constant rate
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Maintaining the water content of the blood between narrow limits
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Storage of urine
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Detailed explanation-1: -Summary. The kidneys maintain homeostasis by controlling the amount of water, ions, and other substances in the blood.
Detailed explanation-2: -The kidneys regulate circulatory volume by controlling sodium and water balance, thus maintaining extracellular fluid volume (ECFV) homeostasis. Simply put, an increase in sodium and water consumption leads to an increase in ECFV, which in turn increases blood volume.
Detailed explanation-3: -Water homeostasis is achieved by regulation of water intake and water loss by the kidneys. The former is achieved by sensations of thirst that motivate water acquisition, whereas the latter is regulated by the antidiuretic action of vasopressin.
Detailed explanation-4: -The nephron Each kidney contains over one million microscopic filtering units called nephrons . Each nephron is made of a kidney tubule and is responsible for ‘cleaning’ the blood by removing urea, excess water and mineral ions. The nephrons reabsorb as much water as is needed by the body to maintain the water balance.