The Kidneys

Excretion

3 main roles:

1)     Removal of urea
2)     Adjustment of water levels
3)     Adjustment of salt levels

ULTRAFILTRATION

• The blood flows through the renal artery into the glomerulus which is a bundle of capillaries

•  A high pressure is built up which squeezes all of the urea, glucose, salt and water out of the blood and into the Bowman’s capsule

• The membranes between the blood vessels in the glomerulus and Bowman’s capsule act like filters so large molecules like proteins and blood cells are …