What is the role of the heart in the formation of tissue fluid?
Ventricle contraction produces high hydrostatic pressure
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Which substances are not found in tissue fluid
Blood cells, proteins
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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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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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How is lymph moved around the lymphatic system
Contraction of body muscles / Hydrostatic pressure of tissue fluid
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Which location as the highest water potential at the arterial end of the capillary?
Tissue fluid
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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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How does lymph re-enter the blood stream?
Veins near the heart
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What is filtration cause by pressure called?
Ultrafiltration
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What does tissue fluid contains
Glucose, amino acids, fatty acids, ions, oxygen
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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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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