Glomerular Filtration Flashcards
1
Q
What forces is glomerular filtration dependant on?
A
Oncotic and hydrostatic pressure
2
Q
What is the normal GFR ?
A
120ml/min
3
Q
What are the usual pressures in the afferent and efferent arterioles of the kidney?
A
Afferent- high pressure as arteriole is wide and short
Efferent- low pressure as arteriole is narrow and long
4
Q
What three extrinsic factors affect GFR?
A
Sympathetic VC nerves afferent and efferent constriction, greater sensitivity of afferent arteriole.
b) Circulating catecholamines constriction 1ily afferent
c) Angiotensin II constriction, of efferent at [low], both afferent and efferent at [high].
5
Q
What intrinsic factor controls GFR?
A
Autoregulation
