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8 Cards in this Set
- Front
- Back
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What are the four types of artery? |
Capillary Arterioles - regulate blood flow Muscular arteries - blood to organs Elastic arteries - surround heart
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Briefly describe the three layers of an artery |
Tunica interna - endothelium tissue, basement membrane Tunica media - external elastic lamina, smooth muscle Tunica externa - connective tissue |
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The smallest veins are called..? |
Venules |
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What are the differences between arteries and veins ? |
Arteries: carry oxygenated blood away from the heart. No valves. More smooth muscle Vein: carry Deoxygenated blood toward the heart. Have valves. Less smooth muscle |
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What are the three types of capillary and where they are found ? |
Continuous - skin/muscles Fenestrated - GI tract Sinusoid - liver, bone marrow and lymph tissue |
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What is blood pressure ? |
A hydrostatic force against the wall of the artery. Measured in mml/mg |
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How is blood pressure regulated ? |
Vasomotor centre - contraction of smooth muscles surrounding vessels Baroreceptor-initiated reflexes - allows vessels to dilate and reduce blood pressure Chemoreceptor-initiated reflexes - causes increased vasoconstriction |
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Capillary dynamics |
The arterial hydrostatic pressure inside the arteries is greater then the osmotic pressure because arteries have alot of smooth muscle to maintain a higher pressure inside the artery. This causes the fluid inside to leak out of the arteries. The venus hydrostatic pressure changes in the veinules because there is less smooth muscle to maintain the hydrostatic pressure , the osmotic pressure is higher which allows fluid to filter into the venules |
