Renal Phys ML: 8 Flashcards
What is the main regulator of plasma osmolarity
ADH
What does ADH do?
it alters water absorption as needed
What happens with ADH when you have excess H2O?
- excess h2o
- low osmolarity in body fluid
- less firing of hypothalamic osmoreceptors
- Less ADH secretion
- Less plasma ADH
- in collecting ducts less permeability to water
- less H2O reaborsbption
- Less H2O excretion
True or false; there is baroreceptor control of ADH secretion
True
When baroreceptors triggers RAAS system what is laso secreted for water regulation?
ADH
Why is ADH secreted when the RAAS system is triggered?
help keeps plasma osmolarity constant by reabsorbing water along with NaCl
Low plasma Volume= Low map which causes
Increased angi 2, aldosterone, and Na+ reabsorption
Increased angi 2, aldosterone, and Na+ reabsorption causes
increased ADH and H20 reabsorption
Diabetes mellitus
failure to reabsorb glucose
What kind of diueresis is diabetes mellitus
osmotic: upsets osmotic gradient by increases solute concentration in urine or filtrate
Diabetes Insipidus
failure of the posterior pituitary to release ADH or failure of kidney to respond to ADH; increased water loss
What kind of diuresis is diabetes insipidus
water
What is an example of aldosterone and ADH working together
Response to sweating
Is sweat hypoosmotic or hyperosmotic
hypoosmotic you are loosing more water than NaCl
What causes a feeling of thirst
- lower plasma volume
- Plasma osmolarity
- Dry, mouth, throat
