2.76B: Understand How Water is Reabsorbed into the Blood from the Collecting Duct

REABSORPTION OF WATER IN COLLECTING DUCT:

Diagram showing the Reabsorption of Water at the Collecting Duct

LOW LEVELS OF WATER	HIGH LEVELS OF WATER
Diagram Showing Osmoregulation when Water Levels in the Body is Low	Diagram Showing Osmoregulation when Water Levels in the Body is High
Hypothalamus detects low levels of Water in body, stimulating Pituitary gland to secrete more ADH Increase in ADH causes membrane of Collecting Duct to become more permeable with the increase in pores, therefore increasing the reabsorption of Water into blood capillaries via Osmosis As more Water is reabsorbed, Water levels in the body is regulated and returned to normal As a result, volume of Urine will decrease and become more concentrated	Hypothalamus detects high levels of water in body, stimulating Pituitary gland to secrete less ADH Decrease in ADH causes membrane of Collecting Duct to become less permeable with the decrease in pores, therefore preventing the reabsorption of Water into blood capillaries As less Water is reabsorbed, Water levels in the body is regulated and returned to normal As a result, volume of urine will increase and become less concentrated (more diluted)