Flashcards in Calcium Homeostasis Deck (9)
Calcium homeostasis refers to regulation of Ca ions in the ICF. True/False?
What effect does hypocalcaemia have on voltage-activated Ca channels?
Opens them, causing hyperactive nerve and muscle conduction (hypocalcaemic tetany)
In hypercalcaemia, calcium ions can combine with phosphate ions to form what?
Calcium phosphate (no shit) "stones" that deposit in blood and kidneys
Which glands secrete the hormone responsible for controlling Ca concentration in the body?
What effect does PTH have on the kidney with regards to Ca homeostasis?
Increases Ca reabsorption
Increases phosphate excretion
Stimulate release of calcitriol (vitamin D)
What effect does PTH have on bone with regards to Ca homeostasis?
Increases Ca pumping into ECF
Increases bone resorption
Which receptors on parathyroid cells are activated in hypocalcaemia?
What effect does calcitriol (active vitamin D) have on the gut with regards to Ca homeostasis?
Increases Ca absorption