Which hormone is primarily secreted by the zona glomerulosa of the adrenal cortex
Which hormone is primarily secreted by the zona glomerulosa of the adrenal cortex?
A. Cortisol
B. Aldosterone
C. Epinephrine
D. Testosterone
Answer: B
Explanation: The adrenal cortex is divided into three zones: zona glomerulosa (outer), zona fasciculata (middle), and zona reticularis (inner). Zona glomerulosa secretes mineralocorticoids, mainly aldosterone, which regulates sodium and potassium balance. Zona fasciculata secretes glucocorticoids (e.g., cortisol, A is incorrect). Epinephrine is secreted by the adrenal medulla (C is incorrect), and testosterone is secreted by the testes and zona reticularis (in small amounts, D is incorrect).
