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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BlackTom AI · Accepted Answer

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

查看解析

登录即可查看完整答案

类似问题

The main substance our bodies are trying to maintain is _______________________.

Question at position 43 How do electrolytes help maintain the body's water balance?By contributing to the osmotic balance that regulates water movementBy absorbing water from the environmentBy producing heat that evaporates excess waterBy turning water into electrolytes

Question at position 40 Which of the following outcomes is most likely when water intake is sufficient?Excess water is stored in muscles for later use.Blood pressure fluctuates significantly.Circulatory and organ functions are impaired.Stable blood volume supports efficient circulation.

Question at position 2 Proper fluid balance is irrelevant to the digestive process because digestive enzymes function independently of water.TrueFalse

Question at position 11 Water volume is most closely tied to the presence of which ion?

Extracellular water volume relies on _______and ________ concentrations.

Which of the following hormones will most likely increase water retention?

In a consumer society, many adults channel creativity into buying things

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希望你的学习变得更简单

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