2.71 Ultrafiltration

2.71 describe ultrafiltration in the Bowman’s capsule and the composition of the glomerular filtrate

Nephron - Structure which carries out the filtration of blood

Produces:

- Filtered blood ("cleaned blood")

- Urine (the waste)

Urine - Water (H2O), salts, urea (N)

Beginning of the nephron structure begins at the Bowman's capsule

Where ultrafiltration begins

Filtration of blood:

1. Blood arriving in the kidney

Afferent arteriole

High pressure (come from an artery)

2. Blood leaving the kidney

Efferent arteriole

Narrow blood vessel (smaller than afferent arteriole)

3. Afferent ==> Efferent

Blood develops a high pressure

Blood pressure increases in glomerulus

4. High pressure forces the liquid in blood (plasma, which includes H2O, salts, amino acids, glucose, urea) into the inside of the Bowman's capsule (and consequently into the glomerula filtrate)

5. Glomerula filtrate

Plasma contains H2O, salts, amino acids, glucose, urea

Blood has been filtered by high pressure

Forces the liquid into the tube

Source: http://click4biology.info/c4b/11/11.3/glomerulus.gif