State the function of aldosterone.

(N/A) Aldosterone is a steroid hormone produced by the adrenal cortex.
It acts primarily on the renal tubules of the kidneys.
It stimulates the reabsorption of $Na^{+}$ ions and water from the filtrate back into the blood.
Simultaneously,it promotes the excretion of $K^{+}$ ions and phosphate ions into the urine.
This process helps in maintaining electrolyte balance,body fluid volume,osmotic pressure,and blood pressure.