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Question about tissue fluid and blood plasma?
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How do substances from the blood plasma enter tissue fluid from the capillaries?
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(Original post by hannah.dykes)
How do substances from the blood plasma enter tissue fluid from the capillaries?
How do substances from the blood plasma enter tissue fluid from the capillaries?
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The key thing to remember is that this happens by diffusion.
Blood plasma is forced out of capillaries due to high pressures at the arterial end (the end where the arteries connect) - it diffuses out.
Then, when it becomes tissue fluid, it bathes the body cells. Oxygen and glucose diffuse into the body cells by the tissue fluid and waste and urea diffuse out.
The tissue fluid seeps back into the capillary at lower pressures (the vein end of the capillary).
Blood plasma is forced out of capillaries due to high pressures at the arterial end (the end where the arteries connect) - it diffuses out.
Then, when it becomes tissue fluid, it bathes the body cells. Oxygen and glucose diffuse into the body cells by the tissue fluid and waste and urea diffuse out.
The tissue fluid seeps back into the capillary at lower pressures (the vein end of the capillary).
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