ADH and osmoregulation p2

Question 1

where are osmoreceptors present

Answer 1

the hypothalamus in the brain
whihc are sensitive to water potential of the blood

Question 2

where is ADH produced

Answer 2

hypothalamus

Question 3

where does ADH produced in the hypothalamus travel down

Answer 3

neurones to the posterior pituitary gland

Question 4

where is ADH released into and by what (not produced)

Answer 4

released into the BLOOD
by the Posterioir pituitary gland

Question 5

what leads urine to have less water in it

Answer 5

-MORE water is reabsorbed from the filtrate by osmosis into the blood

Question 6

what happens to the water potential of the blood when water is reabsorbed from the filtrate

Answer 6

returns to normal

Question 7

what causes ADH secretion to be decreased and by what

Answer 7

-detected by osmoreceptors in the hypothalamus and ADH secretion its decreased by NEGATIVE FEEDBACK

Question 8

when are osmoreceptors in the hypothalamus stimulated

Answer 8

if the water potential in the blood plasma decreases

Question 9

what causes the reduction of osmoreceptors

Answer 9

if water potential of the blood plasma increases

Question 10

describe the steps when theres an increase in water potential of the blood

Answer 10

1) water potential of the blood plasma increases, the stimulation of osmoreceptors is reduced

2)So less ADH is released into the blood and the permeability of the distal tubule and collecting duct is reduced

3)less water is reabsorbed from the filtrate back into the blood . This leads to more water in the urine producing a larger volume. of more dilute urine

4) As less water is reabsorbed from the filtrate into the blood , the water potential decreases to normal .This is detected by osmoreceptors and ADH secretion if regulated by negative feedback .