RAAS

Renin is secreted by the

• kidneys

• lungs

• heart

• brain

Answer explanation

Renin is released from the juxtaglomerular cells in the kidney.

Angiotensin-converting enzyme (ACE) reacts with

• angiotensinogen

• renin

• angiotensin I

• angiotensin II

Answer explanation

The conversion of angiotensin I to angiotensin II is catalyzed by an enzyme called angiotensin-converting enzyme

(ACE).

The following is FALSE of the role of renin-angiotensin-aldosterone system (RAAS):

• modulating blood volume

• sodium reabsorption

• potassium reabsorption

• water reabsorption

Answer explanation

The renin-angiotensin-aldosterone system is primarily associated with blood pressure regulation by modulating blood volume, sodium reabsorption, potassium secretion, water reabsorption, and vascular tone.

in response to increases in blood pressure, renin release is inhibited by

• brain natriuretic peptide

• prostagladin

• atrial natriuretic peptide 

• nitric oxide

Answer explanation

The release of renin is inhibited by atrial natriuretic peptide (ANP), which is released by stretched atria in response to increases in blood pressure.

The most potent vasoconstrictor in the body is

• angiotensin I

• angiotensin II

• aldosterone

• renin

Answer explanation

Angiotensin II (ATII) is a very potent vasoconstrictor of the afferent and efferent arterioles, acting on two types of receptors, the AT1 and the AT2 receptor subtypes.