Question

Secretion of aldosterone in birds, man and other mammals is stimulated by :

• A. Fall in concentration of $N{a}^{+}$in blood plasma
• B. Rise in concentration of $K^{+}$in blood plasma
• C. Both (A) & (B)
• D. Fall in $C{a}^{++}$concentration in blood plasm

Answer 1

The correct option is C Both (A) & (B)

Aldosterone acts mainly at the renal tubules and stimulates the reabsorption of $N{a}^{+}$ and water and excretion of $K^{+}$ and phosphate ions.

Potassium modulates circulating testosterone and suggest that this cation could exert an important regulatory role in controlling androgen actions.

Thus, aldosterone helps in the maintenance of electrolytes, body fluid volume, osmotic pressure and blood pressure.