Question

question 9 of 10
although not designated as endocrine glands, several organs within the body secrete hormones
as part of their normal function. which organ secretes hormones involved in increasing blood
pressure and volume and maturation of red blood cells?

• cardiac atria
• brain
• kidneys
• liver

Explanation:

To solve this, we analyze each option:

• Cardiac atria secrete atrial natriuretic peptide (ANP) which decreases blood pressure/volume, so not correct.
• The brain (e.g., hypothalamus, pituitary) has hormonal roles but not directly for increasing blood pressure/volume and red blood cell (RBC) maturation.
• Kidneys secrete renin (increases blood pressure/volume via the renin - angiotensin - aldosterone system) and erythropoietin (stimulates RBC maturation), matching the requirements.
• Liver has roles in metabolism, detoxification, etc., not in these specific hormonal functions.

Answer:

C. kidneys