- are strong, thick (in order to withstand pressure since they are the closest to the heart) -made of elastic walls -have high pressure/low volume
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describe the characteristics of veins
-weak walls -wider lumen (lumen = open space) -have low pressure but high volume -hold 54% of total blood volume
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where does vasoconstriction and vasodilation occur?
in the arterioles in order to control the flow of blood in capillaries
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what is the structure of capillaries and why is it important to it's function?
made of a single layer of epithelium to allow a rapid exchange of substances
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how does blood pump into the heart from veins?
through skeletal muscle pump
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what structure keeps veins flowing one way?
venous valves
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what is the function of the coronary artery?
serves as the blood supply for the heart, thus nourishes it.
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what is coronary artery disease?
Insufficient blood flow (ischemia) to the heart due to change in artery [causes heart attacks]
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what is the main function of the lymphatic system?
-transports excess ISF that is filtered out of blood vessels back to the blood -transport fat absorbed from the small intestine into the blood -has lymphocytes to defend against disease -lymph nodes to remove pathogens in fluid before returning to blood