Answer :

Selective reabsorption is the process in which some molecules like glucose, ions and certain amino acids get reabsorbed from the filtrate as they pass through the neuron. Sodium reabsorption in the late distal tubule and collecting duct is regulated by hormones, which stimulate or inhibit sodium reabsorption as necessary.

Kidney function is monitored by hormones like: ADH i.e. Antidiuretic hormone and ANF i.e. Atrial Natriuretic Factor.

ADH facilitates reabsorption of water from the DCT and collecting duct by increasing the water and salt permeability as well as by accelerating ion and water transfer by osmotic gradient creation.

The adrenal cortex is activated by Angiotensin II as a result of which aldosterone is released.

Aldosterone in turn induces the DCT to absorb more ions and water.

ANF regulates blood flow by causing vasodilation and increasing excretion of sodium.

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