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How does the body respond to low blood volume?

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Question: How does the body respond to low blood volume?

Options:

  1. Increased urine output
  2. Release of renin
  3. Decreased thirst
  4. Increased glomerular filtration rate

Correct Answer: Release of renin

Solution: 

In response to low blood volume, the body releases renin, which activates the renin-angiotensin-aldosterone system to help restore blood volume.

How does the body respond to low blood volume?

Practice Questions

Q1
How does the body respond to low blood volume?
  1. Increased urine output
  2. Release of renin
  3. Decreased thirst
  4. Increased glomerular filtration rate

Questions & Step-by-Step Solutions

How does the body respond to low blood volume?
  • Step 1: The body detects low blood volume, which can happen due to dehydration or blood loss.
  • Step 2: The kidneys sense the low blood volume and release an enzyme called renin.
  • Step 3: Renin starts a process called the renin-angiotensin-aldosterone system (RAAS).
  • Step 4: Renin converts a protein in the blood (angiotensinogen) into angiotensin I.
  • Step 5: Angiotensin I is then converted into angiotensin II, which has several effects.
  • Step 6: Angiotensin II causes blood vessels to narrow, increasing blood pressure.
  • Step 7: Angiotensin II also stimulates the adrenal glands to release aldosterone.
  • Step 8: Aldosterone helps the kidneys retain sodium and water, which increases blood volume.
  • Step 9: As blood volume increases, blood pressure stabilizes and returns to normal.
  • Renin-Angiotensin-Aldosterone System (RAAS) – The physiological mechanism activated in response to low blood volume, involving the release of renin, which leads to increased blood pressure and volume.
  • Hormonal Response to Low Blood Volume – The body's endocrine response involving hormones like aldosterone that promote sodium and water retention to increase blood volume.
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