Osmoregulation

what is it

water content of blood is regulated

what might cause a rise in solute conc

too little water taken in
sweating
large amounts of ions taken in

where is ADH secreted from
target organ
what feedback principle

posterior pituitary gland
kidney
negative

how is the hypothalamus involved

contains osmoreceptors
produces ADH

how is the posterior pituitary involved

adh moves from hypothalamus to posterior
PP then releases ADH into bloodstream

steps when there is a rise in solute conc

osmoreceptors detect Dec in WP

hypo produces ADH

osmo send nerve impulses to PP to release more ADH into blood

ADH binds to receptors on CS membrane of DCT and CD

permeability inc

more H20 leaves DT and CD by osmosis

urine more conc and less vol

what does ADH binding also lead to

inc CD permeability of urea