[Campbell Biology P.1045] Which of the following sequences accurately describes a part of the... | Practice Question

Which of the following sequences accurately describes a part of the Renin-Angiotensin-Aldosterone System RAAS activated in response to a drop in blood pressure or volume?

  • A: JGA releases renin → Renin converts angiotensinogen to angiotensin I → ACE converts angiotensin I to angiotensin II
  • B: Adrenal gland releases aldosterone → Aldosterone causes vasoconstriction → Increased blood pressure
  • C: Liver releases angiotensinogen → Renin converts angiotensinogen to angiotensin II → Angiotensin II stimulates adrenal glands to release renin
  • D: JGA detects increased pressure → Renin release inhibited → Blood volume increases

Explanation

The Renin-Angiotensin-Aldosterone System RAAS is initiated when sensors in the juxtaglomerular apparatus JGA detect a drop in blood pressure or volume. The JGA responds by releasing the enzyme renin. Renin then converts angiotensinogen a plasma protein from the liver into angiotensin I. Subsequently, angiotensin-converting enzyme ACE transforms angiotensin I into the active peptide angiotensin II. This sequence accurately describes the initial and critical steps of RAAS activation.