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4 Cards in this Set
- Front
- Back
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How does the structure of an artery suit it to its function? |
- Muscle layer is thick. Can be constricted and dilated to control the volume of blood passingthrough. - Elastic layer is thick. Maintains high pressure. - Thick Walls. Resiststhe vessel bursting under pressure. - There are no valves because blood isunder constant high pressure. |
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How does the structure of an arteriole suit it to its function? |
- Muscle layer is thicker than arteries. Thecontraction of this layer allows control over blood flow. - Elastic layer is thinner than arteries because blood pressure is lower |
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How does the structure of an vein suit it to its function? |
- Muscle layer is thin because veinscarry blood away from tissues. - Elastic layer is thin because lowpressure of blood will not cause them to burst. - Wall is thin. pressureis low. - There are valves to prevent backflow. |
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How does the structure of a capillary suit it to its function? |
- Very thin walls. Short diffusion path. - Numerous and highly branched: Largesurface area. - Narrow diameter. Permeate tissues. - Lumen is narrow. Reduces diffusiondistance. - Spaces between lining so white bloodcells can escape. |
