16.7 role of hormones in osmoregulation Flashcards
1
Q
explain how water potential of the blood is regulated when water potential falls
A
- detected by the hypothalamus
- osmoreceptors
- ADH produced
- increases permeability to water in DCT and the collecting duct
- ADH increases the permeability of the collecting duct to urea
- water leaves the duct and enters the blood
- also encourages individual to drink more water
- smaller volume of urine
- urine becomes more concentrated
2
Q
explain how water potential of the blood is regulated when water potential rises
A
- detected by the hypothalamus
- osmoreceptors
- detects a rise in water potential
- less ADH produced
- decrease in permeability of the collecting duct
- larger volume of urine
- urine becomes less concentrated
3
Q
a rise in solute concentration lowers its water potential caused by…
A
- too little water being consumed
- much sweating occurring
- large amounts of ions being taken in
4
Q
a fall in solute concentration raises its water potential caused by…
A
- large volumes of water being consumed
- salts used in metabolism or excreted not being replaced in the diet
