Tissue fluid is a watery substance that contains glucose, amino acids, fatty acids, salts and oxygen
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Tissue fluid is the means by which...
Materials are exchanged between blood and cells
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How is tissue fluid formed?
By blood plasma
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What is the process by which substances are exchanged?
Diffusion
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What pressure is created at the arterial end of the capillary?
Hydrostatic pressure
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What are the two opposing forces?
Hydrostatic pressure of the tissue fluid outside of the capillaries and the lower water potential of the blood
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What forces tissue fluid out of the capillaries?
Hydrostatic pressure
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Why is only tissue fluid pushed out of the arteries?
The pressure is only enough to force small molecules out of the capillaries, leaving all cells and proteins in the blood
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What is the name of this type of filtration under pressure?
Ultrafiltration
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When is the tissue fluid returned to the circulatory system?
Once the tissue fluid has exchanged metabolic materials with the cells it bathes in
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How does tissue fluid return?
Most tissue fluid returns to the blood plasma directly via the capillaries
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What happens as a result of loss of tissue fluid from the capillaries?
The hydrostatic pressure inside the capillaries drops
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What happens to the hydrostatic pressure by the time the blood has reached the venous end of the capillary?
The hydrostatic pressure is less than that of the tissue fluid outside it
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What happens as a result of this?
Tissue fluid is forced back into the capillaries by the higher hydrostatic pressure outside them
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What happens to water in the blood?
The osmotic forces resulting from the proteins in the blood plasma pull water back into the capillaries
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What has the tissue fluid lost?
The tissue fluid has lost much of its oxygen and nutrients by diffusion into the cells that is bathed
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What has the tissue fluid gained?
Carbon dioxide and waste materials
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Not all tissue fluid can return to the capillaries. How is the rest carried back?
Via the lymphatic system
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What is the lymphatic system?
A system of vessels that begin in the tissues and gradually merge into larger vessels that form a network throughout the body
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What do these large vessels do?
They drain their contents back into the bloodstream via two ducts that join veins close to the heart
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What are the two ways the contents of the lymphatic system are moved?
Hydrostatic pressure of the tissue fluid that has left the capillaries and contraction of body muscles that squeeze the lymph vessels - valves in the lymph vessels ensure that the fluid inside them move away from tissues in the direction of the heart
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Other cards in this set
Card 2
Front
Tissue fluid is the means by which...
Back
Materials are exchanged between blood and cells
Card 3
Front
How is tissue fluid formed?
Back
Card 4
Front
What is the process by which substances are exchanged?
Back
Card 5
Front
What pressure is created at the arterial end of the capillary?
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