What is the primary effect of the renin-angiotensin-aldosterone system (RAAS)?

Practice Questions

Q1
What is the primary effect of the renin-angiotensin-aldosterone system (RAAS)?
  1. Decrease heart rate
  2. Increase blood volume and pressure
  3. Decrease blood glucose levels
  4. Increase oxygen delivery to tissues

Questions & Step-by-Step Solutions

What is the primary effect of the renin-angiotensin-aldosterone system (RAAS)?
  • Step 1: The body detects low blood pressure or low blood volume.
  • Step 2: The kidneys release an enzyme called renin.
  • Step 3: Renin converts a protein in the blood called angiotensinogen into angiotensin I.
  • Step 4: Angiotensin I is converted into angiotensin II by an enzyme in the lungs.
  • Step 5: Angiotensin II has several effects: it constricts blood vessels to increase blood pressure.
  • Step 6: Angiotensin II stimulates the adrenal glands to release aldosterone.
  • Step 7: Aldosterone causes the kidneys to retain sodium and water.
  • Step 8: Retaining sodium and water increases blood volume, which raises blood pressure.
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