Contraction of body muscles / Hydrostatic pressure of tissue fluid
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15
Which location as the highest water potential at the arterial end of the capillary?
Tissue fluid
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What creates hydrostatic pressure?
Pumping of the heart
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How does lymph re-enter the blood stream?
Veins near the heart
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15
Why do substances move out of the tissue fluid at the venous end of the capillary?
Pressure outside the capillary greater than tissue fluid
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15
The hydrostatic pressure of the blood at the arteriole end of the capillary helps to form tissue fluid. Explain how.
Hydrostatic pressure higher than osmotic âeffectâ; Forces / squeezes / pushes out / water / small molecules / ions / examples;
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How does tissue fluid return to the blood stream?
Via capillaries and lymphatic system
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15
What is filtration cause by pressure called?
Ultrafiltration
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15
Lymphoedema is a swelling in the legs which may be caused by a blockage in the lymphatic system. Suggest how a blockage in the lymphatic system could cause lymphoedema.
Excess tissue fluid cannot be (re)absorbed / builds up
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15
Why do substances move into tissue fluid at the arterial end of the capillary?
Pressure inside capillary greater than tissue fluid
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The hydrostatic pressure falls from the arteriole end of the capillary to the venule end of the capillary. Explain why.
Loss of water / loss of fluid / friction (against capillary lining).
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What is the purpose of tissue fluid
Allows exchange between blood and cells
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What is the role of the heart in the formation of tissue fluid?
Ventricle contraction produces high hydrostatic pressure
