Which one of the following statements in regard to the excretion by the human kidneys is correct?
Correct answer: C. Nearly 99% of the glomerular filtrate is reabsorbed by the renal tubules
- A. Descending limb of loop of Henle is impermeable to water
- B. Distal convoluted tubule is incapable of reabsorbing HCO3-
- C. Nearly 99% of the glomerular filtrate is reabsorbed by the renal tubules
- D. Ascending limb of loop of Henle is impermeable to electrolytes.
Explanation
Urine formation involves three main processes namely, glomerular filtration, reabsorption and secretion, that takes place in different parts of the nephron. A comparison of the volume of the filtrate formed per day (180 litres per day) with that of the urine released (1.5 litres), suggest that nearly 99 percent of the filtrate is reabsorbed by the renal tubules. The descending limb of loop of Henle is permeable to water but almost impermeable to electrolytes. The ascending limb is impermeable to water but allows transport of electrolytes actively or passively. Conditional reabsorption of Na + and water takes place in distal convoluted tubule. It is also capable of reabsorption of HCO 3-
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About Homeostasis
Homeostasis maintains a stable internal environment through the kidney and urinary system, thermoregulation and excretion. The kidney topics include filtration, selective reabsorption, urine formation and water balance, while thermoregulation involves sweating, vasodilation, vasoconstriction and hormonal control; excretion is different from egestion, which removes undigested food.
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