Blood vessels and their functions 7.6

what are the roles of the arteries
carry blood away from the heart and into the arterioles
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what is the role of the arterioles
control blood flow from arteries to capillaries
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what are the capillaries
blood vessels that link arterioles to veins
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what are the role of veins
carry blood towards the heart
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what are the basic structure of veins,arterioles and arteries
They have a tough fibrous outer layer, muscle layer, elastic layer, thin inner lining and lumen
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what is the advantage of arteries having a thick muscle layer
They can be constricted and dilated in order to control blood flow
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what is the advantage of having a thick elastic layer in arteries
To keep blood under high pressure the recoiling and stretching helps to create a smooth pressure
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what is another advantage of arteries
To resist the vessel bursting
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why are there no valves in the arteries
Because the blood is under high pressure
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Why is the muscle layer thicker in the arteriole than in the arteries
The contraction allows constriction of lumen, restricting the flow of blood into capillaries
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why is the elastic layer thinner in arterioles
Because blood pressure is lower
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why do veins have thin muscle layers
They carry blood away from tissues and therefore their dilations and constrictions cannot control blood flow
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why is the elastic layer thin in veins
blood is under less pressure therefore it does it will not burst and too low to recoil
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why is the overall thickness of the wall small in veins
The pressure in the veins is too low to create any kind of bursting
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Why do the walls consist of the lining layer
Distance over which diffusion takes place is short
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why are the capillaries highly branched
To provide a large surface area for exchange
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why do capillaries have a narrow diameter
shorter diffusion distance
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why is the lumen of the capillary narrow
Red blood cells squeezed against capillary bringing them closer to the cells which they supply oxygen
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what is the pressure called created by the heart
Hydrostatic pressure
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what are the two outward pressures that oppose tissue fluid moving out the plasma
Hydrostatic pressure outside the tissue fluid resists outward movement of the liquid, and lower water potential of the blood due to plasma proteins
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how is tissue fluid returned to the circulatory system
hydrostatic pressure reduced due to loss of tissue fluid,hydrostatic pressure now lower inside than the tissue fluid outside,tissue fluid forced back inwards by the higher hydrostatic pressure outside, plasma loses water and low WP therefore leaves.
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Other cards in this set

Card 2

Front

what is the role of the arterioles

Back

control blood flow from arteries to capillaries

Card 3

Front

what are the capillaries

Back

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Card 4

Front

what are the role of veins

Back

Preview of the front of card 4

Card 5

Front

what are the basic structure of veins,arterioles and arteries

Back

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