In the physiology of the kidney,<unk>  <unk>  is the volume of<unk>  delivered to the kidneys per unit time. In humans, the kidneys together receive roughly 25% of cardiac output, amounting to 1.2 - 1.3 L/min in a 70-kg adult male. It passes about 94% to the cortex.<unk>  is closely related to<unk>  plasma<unk>  (RPF), which is the volume of<unk>  plasma delivered to the kidneys per unit time. While the terms generally apply to arterial<unk>  delivered to the kidneys, both<unk>  and RPF can be used to quantify the volume of venous<unk>  exiting the kidneys per unit time. In this context, the terms are commonly given subscripts to refer to arterial or venous<unk>  or plasma<unk> , as in<unk> a,<unk> v, RPFa, and RPFv. Physiologically, however, the differences in these values are negligible so that arterial<unk>  and venous<unk>  are often assumed equal.
Renal blood flow
Renal threshold
Glomerular filtration rate
Free water clearance
Effective renal plasma flow
Limb perfusion
Renal protein reabsorption
Renal sodium reabsorption