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NEETZoologyExcretory Products and their Elimination

A person meets with a severe accident resulting in significant blood loss. This sudden drop in blood volume and blood pressure will immediately trigger which of the following physiological responses to restore homeostasis?

Options

  1. AIncreased secretion of Atrial Natriuretic Factor (ANF) from the atria of the heart
  2. BActivation of JG cells to release renin into the blood
  3. CSuppression of ADH release by the osmoreceptors in the hypothalamus
  4. DDecrease in aldosterone secretion from the adrenal cortex

Correct answer

B. Activation of JG cells to release renin into the blood

Step-by-step solution

Severe blood loss causes a significant drop in blood volume, blood pressure, and Glomerular Filtration Rate (GFR). According to NCERT, a fall in GFR or glomerular blood pressure activates the Juxtaglomerular (JG) cells to release renin. Renin converts angiotensinogen in blood to angiotensin I and further to angiotensin II. Angiotensin II is a powerful vasoconstrictor that increases glomerular blood pressure and stimulates the adrenal cortex to release aldosterone, which promotes reabsorption of Na ^+ and water from

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