Question at position 23 How does the hypothalamus respond when ECF volume rises?By stimulating thirst and ADH releaseBy promoting aldosterone synthesisBy reducing thirst and inhibiting ADH secretionBy increasing epinephrine secretion

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Consider the question about hypothalamic responses to a rise in extracellular fluid (ECF) volume. This scenario lowers osmolality and signals the body to reduce water conservation and promote excretion.
Option 1: 'By stimulating thirst and ADH release' This would increase water intake and promote water retention, opposing a rise in ECF volume. Stimulating thirst plus ADH release would conserve water, which is inconsistent with the body's goal when ECF volume is high.
Option 2: 'By promoting aldosterone synthesis' Aldosterone mainly promotes sodium reabsorption in the kidneys, which tends to retain water and expand blood volume further. In the context of rising ECF volume, the body would not promote aldosterone that would counteract diuresis.
Option 3: 'By reducing thirst and inhibiting ADH secretion' Reducing thirst decreases water intake, and inhibiting ADH (vasopressin) promotes free water excretion by reducing water reabsorption in the collecting ducts. This combination aligns with mechanisms aimed at decreasing ECF volume and restoring balance.
Option 4: 'By increasing epinephrine secretion' Epinephrine primarily mediates acute sympathetic responses and metabolic effects rather than directly controlling the water balance in response to ECF volume changes. It is not the primary pathway for adjusting fluid volume through thirst and ADH.
In summary, the body's homeostatic response to a rise in ECF volume focuses on reducing water conservation and promoting diuresis, which is accomplished by lowering thirst and inhibiting ADH release rather than encouraging water intake, aldosterone-driven reabsorption, or sympathetic adrenaline effects.

Question at position 23 How does the hypothalamus respond when ECF volume rises?By stimulating thirst and ADH releaseBy promoting aldosterone synthesisBy reducing thirst and inhibiting ADH secretionBy increasing epinephrine secretion

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Question at position 23 How does the hypothalamus respond when ECF volume rises?By stimulating thirst and ADH releaseBy promoting aldosterone synthesisBy reducing thirst and inhibiting ADH secretionBy increasing epinephrine secretion

View Explanation

Log in for full answers

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