B12 - homeostasis Flashcards
What is vasoconstriction
Where muscles connecting artery to capillaries contracts so blood can’t go through arteries, reducing heat loss to surroundings
What is vasodilation
Where muscles connecting artery to capillaries relaxes so blood flows to capillaries
What is the difference between hyperthermia and hypothermia
Hypothermia is too cold, hyperthermia is too hot
What organ removes waste products from blood
Kidney
What artery takes blood to kidney to be cleaned
Renal artery
What connects kidneys to bladder
Ureters
What are the parts of the kidney called
Outside is cortex, main bit is medulla, triangle bits are pyramids, inside supporting bit is pelvis
What happens at the bowman’s capsule
The end of a kidney tubule wraps around a section of the blood vessel and urea, salts, ions and water diffuses into the kidney tubule
What substances diffuse back into the blood
Salts, ions, some water
What controls how much water diffuses back into the bloodstream
The pituitary gland detects water levels in blood, releases certain amount of ADH which controls permeability of collecting duct which allows water back into the blood
What is kidney dialysis
Where a machine takes blood out of someone and cleans it and puts it back in because the patients kidney doesn’t work
How does kidney dialysis work
Dialysis fluid is pumped next to the blood with a membrane between them and so stuff diffuses from the blood to the dialysis fluid, dialysis fluid goes opposite way to maintain concentration gradient
