16.7- Role of ADH

Question 1

What happens if there is too much water in the blood

Answer 1

• Osmoreceptors in the hypothalamus will detect the high water potential
• causing more water in cells causing to swell
• Less ADH is secreted by the pituartiy gland
• The DCT and collecting duct are less permeablle to water
• Less water is reabsorbed into the bloodstream
• Decrease concentration of urine
• Increase volume of urine

Question 2

What happens if there is too little water in the blood?

Answer 2

• Osmoreceptors in the hypothalamus detect the lower water potential in blood
• Moves water leaves cells - shrink
• More ADH is secrected by the pituarity gland
• The DCT and collectign duct are more permeabel to water
• More water is reabsorbed
• Decrease volume of urine
• Increase concentration of urine

Question 3

What happens when there is more ADH?

Answer 3

• ADH travels by blood plasma
• More ADH will bind to the complemenatry receptors on DCT
• This will trigger more enzyme-controlled reactions
• Inside DCT has vesicles with auqporins
• More vesicles fuse and place aquaporins at bottom of DCT
• More water will move bt aquaporins inot blood stream by osmosis
• From cell into blood stream - lumen of collecting duct

Question 4

What happens if there is less ADH?

Answer 4

• Less ADH will bind to the complemenatry receptors on DCT )low con in blood)
• This will trigger fewer enzyme-controlled reactions
• Causes less vesicles with less aquaporins attached fuse at bottom of DCT
• Less water move out of aquaporins
• Less water asborbed into blood stream by osmosis

Question 5

What does ADH stand for?

Answer 5

Antidiuretic hormone

Made in hypothalamus

Stored in posterior pituartiy gland