Nephron

The kidney contains thousands of nephrons, as blood passes through them the follow happens:

Ultrafiltration.

Blood flows into the glomerulus via the renal artery, the glomerulus is a bundle of capillaries at the start of the nephron.

High pressure builds up and squeezes, water, urea, salt and glucose, out of the blood and into the Bowman's capsule.

The membranes between the glomerulus and bowman's act as a filter, the filter only allowing small molecules through, larger molecules such as proteins and blood cells stay in the blood.

What is left in the bowman's capsule, is a filtered liquid known as glomerular filtrate.

	Criado por lingox mais de 12 anos atrás

IGCSE Biology Paper 1B Notas sobre The kidneys - Excretion, criado por lingox em 07-05-2014.