Role of Antidiuretic and Aldosterone hormone

Control of water content of blood

DURING HIGH OSMOTIC PRESSURE

low water intake , high salt intake , sweating excessively

Osmoreceptor in hypothalamus is stimulated

• This will send impulse to posterior pituitary gland
  
• This will also send impulse to thirst centre cause feeling thirsty(induce more water to intake)

Wall of distal convoluted tubule and collecting duct increases its permeability to water

More water is reabsorbed 

More concentrated urine with reduced volume is excreted (hypertonic urine)

Then the blood osmotic pressure return to normal

Control of blood sodium and potassium ions of urine

DURING HIGH BLOOD SODIUM LEVEL

due to high salt intake

Produce a high pressure and blood volume

• Juxtaglomerular complex is not stimulated.No rennin and angiotensin II is formed
• Heart atrial cardiac muscle secrete atrial natriuretic peptide hormone. Natriuretic peptide hormone inhibit the secretion of aldosterone by adrenal gland

Less aldosterone is released from adrenal gland so that to decrease the permeability of distal convoluted tubule and collecting duct to sodium ion by decreasing the nunber of sodium potassium pump

Less sodium ion is reabsprebed in distal cpnvoluted tubule and collecting duct

The blood sodium level return to normal level