Posterior pituitary Flashcards
what 2 hormones are secreted from the posterior pituitary and their function
ADH - controlling water secretion in urine
Oxytocin - expression of milk, promotes starting labour
define osmolality
Concentration of particles per kilo of fluid
Body water loss = ______ in osmolarity
a)increase
b)decrease
increase
increased osmolarity = _______ in ADH
a)increase
b) decrease
increase
Is ADH and oxytocin produced in hypothalamus or posterior pituitary
Produced in hypothalamus and is secreted by the posterior pituitary
total body water = xLitres
42
When drinking water what happens to the following
Plasma osmolality
Thirst
Water intake
ADH
Renal water excretion
Total body water
decrease
decrease
decrease
decrease
increase
decrease
when in water deficit what happens to the following
Plasma osmolality
Thirst
Water intake
ADH
Renal water excretion
Total body water
increase
increase
increase
increase
decrease
increase
what stimulates production of aquaporins in the collecting ducts
ADH
which 2 types of receptors regulate ADH release
osmoreceptors in the hypothalamus
Baroreceptors within arterial system detect blood pressure inc/dec
which substances affect osmolality
sodium, potassium, chloride, bicarbonate, urease and glucose
what is a normal osmolality
282-295 mOsmol/Kg
what can affect vasopressin
age, pregnancy, rapid water intake
If a patient is passing 6 litres per day with a sodium of 154 mmcl/l,
What is the relevant physiology
What is the relevant anatomy
what is differential diagnosis
ADH its not being secreted
Poster pituitary/kidney damage
polyuria, habitual drinkers
polyuria =
large volume urine
