tissue fluid and lymph

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4 Terms

1
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what is tissue fluid? what does it contain?

  • fluid which passes out of the blood and bathes the tissue cells

  • contains mostly water, glucose, amino acids, fatty acids, ions and oxygen

  • (virtually same composition as blood plasma, just w/o proteins and cells)

2
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describe the process of tissue fluid formation:

  • at the arterial end of the capillary, there is a high hydrostatic pressure due to contraction of the ventricles

  • there is a Ψ gradient into the capillaries (due to the hydrophilic plasma proteins exerting an oncotic pressure), but the hydrostatic pressure is greater and so overcomes this

  • ultrafiltration - water and dissolved substances, e.g. glucose forced out through the gaps (fenestrations) between the capillary endothelial cells, forming tissue fluid

  • proteins and RBCs are too large to pass through so remain in the capillaries

<ul><li><p>at the arterial end of the capillary, there is a high hydrostatic pressure due to contraction of the ventricles</p></li><li><p>there is a Ψ gradient into the capillaries (due to the hydrophilic plasma proteins exerting an oncotic pressure), but the hydrostatic pressure is greater and so overcomes this</p></li><li><p>ultrafiltration - water and dissolved substances, e.g. glucose forced out through the gaps (fenestrations) between the capillary endothelial cells, forming tissue fluid</p></li><li><p>proteins and RBCs are too large to pass through so remain in the capillaries</p></li></ul><p></p>
3
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describe the process of tissue fluid reabsorption:

  • at the venule end of the capillary, the hydrostatic pressure is lower due to loss of water/fluid

  • Ψ in capillaries is lower than in the tissue fluid due to proteins remaining in the blood

  • water returns from tissue fluid to the venous end of the capillaries by osmosis down the Ψ gradient

  • the lymphatic system collects any XS tissue fluid which returns to the circulatory system

4
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<p>summarise the composition of tissue fluid surrounding the arterial and venule end of the capillaries and that of the blood plasma at the arterial end:</p>

summarise the composition of tissue fluid surrounding the arterial and venule end of the capillaries and that of the blood plasma at the arterial end:

<p></p>