Tissue Fluid and Lymph

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  • Created by: Kate
  • Created on: 18-03-14 19:01

How fluid leaves the capillaries from the arteriol

The hydrostatic pressure is higher than the osmotic pressure/solute potential difference.

This cancels the osmotic effect.

Fluid flows out of the capillaries.

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How fluid enters the capillaries at the venous end

The hydrostatic pressure is lower than the solute potential difference.

Fluid moves into the capillaries.

However, not all fluid is reabsorbed. 

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How tissue fluid re-enters the blood

Tissue diffuses by osmosis into the lymph vessel due to the water potential gradient.

Once the tissue fluid enters a lymph vessel it is known as 'lymph'.

Lymph is returned to the blood via the subclavian vein.

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Hydrostatic pressure

Hydrostatic pressure is caused by the ventricles contracting.

Factors affecting hydrostatic pressure

  • Further distance from heart
  • Fluid decreases
  • Friction caused by blood cells on capillary walls 
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