Question

multiple choice question
identify the correct definition for renin.
∘ pertaining to the kidney or bladder
∘ substance that causes an increase in the blood pressure
∘ part of the renal tubule where reabsorption occurs
∘ plexus of capillaries; part of a nephron

Explanation:

• The first option ("Pertaining to the kidney or bladder") describes terms like "renal" or "urinary", not renin.
• Renin is an enzyme (a substance) that helps regulate blood pressure by triggering a cascade that increases blood pressure, so the second option matches.
• The third option refers to a part of the renal tubule (like the proximal convoluted tubule), not renin.
• The fourth option describes the glomerulus (a capillary plexus in the nephron), not renin.

Answer:

B. Substance that causes an increase in the blood pressure