Urinalysis and Body Fluids 6th Edition by Majorie DiLorenzo, Susan Strasinger

Exercise 17

The primary chemical affected by the renin-angiotensinaldosterone system is:

A. Chloride

B. Sodium

C. Potassium

D. Hydrogen

Step 1 of 2

Renin-angiotensin-aldosterone system:

It is a hormone system of the body which regulates the flow of blood in the body.

• When the blood flow in the kidney is decreased, pro-renin of the blood is converted into renin by juxtaglomerular nephron of the kidney.

• Renin converts the angiotensinogen (secreted in liver) to angiotensin.

• Angiotensin I is converted into angiotensin II by the enzyme angiotensin converting enzyme.

• Aldosterone causes reabsorption of sodium and water in the tubules of kidney.

• This system will cause high blood pressure.

Sodium:

• Sodium is the substance that is re-absorbed by the proximal convoluted tubule of the nephron in kidney during filtration.

• The re-absorption is stimulated by aldosterone of adrenal cortex by the renin angiotensin aldosterone system.

Therefore, renin-angiotensin-aldosterone system affects the primary chemical “sodium”. Hence, the correct answer is option .