Which location as the highest water potential at the arterial end of the capillary?
Tissue fluid
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15
Explain how fluid leaves the capillary at the arterial end.
hydrostatic pressure / blood pressure / arterial pressure; greater than osmotic effect which forces molecules / fluid out;
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15
What is filtration cause by pressure called?
Ultrafiltration
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15
What is the purpose of tissue fluid
Allows exchange between blood and cells
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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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15
High absorption of salt from the diet can result in a higher than normal concentration of salt in the blood plasma entering capillaries. This can lead to a build-up of tissue fluid.
1. (Higher salt) results in lower water potential of tissue fluid; 2. (So) less water returns to capillary by osmosis (at venule end);
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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
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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15
Which location has the highest water potential at the venous end of the capillary?
Tissue fluid
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15
How does tissue fluid return to the blood stream?
Via capillaries and lymphatic system
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15
What does tissue fluid contains
Glucose, amino acids, fatty acids, ions, oxygen
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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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boom
Lose 50 points!
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15
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).
