Nephrons are filtration units in the kidneys.
1) Ultrafiltration:
High pressure built up, this squeezes water, urea,ions and glucose out of the blood into the BOWMAN'S CAPSULE.
The GLOMERULUS and BOWMAN'S CAPSULE act like filters. (Big molecules like proteins and blood cells not removed.)
2)Reabsorption:
Useful substances reabsorbed such as all the glucose. (Moved from nephron back into blood AGAINST CONC GRADIENT)
Sufficient water reabsorbed according to level of ADH.This process is called OSMOREGULATION.
3)Release of wastes:
Urea and excess water not reabsorbed.
Continue out of nephron, into URETER and down to the BLADDER as URINE.
URINE released through URETHRA.
Comments
No comments have yet been made