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19 Cards in this Set
- Front
- Back
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blood vessels
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-form a closed circut of tubes that transport blood between the heart and body cells
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blood vessels include
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-arteries
-arterioles -capillaries -venules -veins |
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arteries
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-adapted to carry relitively high pressure blood from the heart
-walls consist of layers of endothelial,smooth muscle,and connective tissue -autonomic nerve fibers can stimulate vasoconstriction/vasodialation |
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arterioles
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-branches off arteries
-walls consist of layers of endothelial,smooth Muscle and connective tissue -autonomic nerve fibers can stimulate vasconstriction/vasodialation |
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capillaries
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connect arterioles with venules
» form a semipermiable membrane |
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capillary permeability
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- opening in walls are the thin slits between epithelial cells
- sizes of openings vary from tissue to tissue |
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capillary arrangement
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-capillary density varies directly with tissues metabolic rates
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venules
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continue from capillaries and merge to form veins
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veins
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-carry blood back to the heart
- venous walls are very similar to capillary walls BUT are thinner and contain less muscle and elastic tissues » possess valves |
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cardiovascular endurance
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the ability of the lungs and heart to work together to sustain effort over time
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cardiovascular endurance characterized by
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1. increase in O2 delivery and cardiac out put
2.increase heart strength&stroke volume 3.decrease resting pulse 4.increase breathing efficiancy 5.improved circulation 6. decrease blood pressure |
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blood pressure
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force blood exerts againsts inside of blood vessels
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arterial blood pressure
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produced primarily by heart action
» increase and decrease in phases of cardiac cycle |
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systolic pressure
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when ventricles contract
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diastolic pressure
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when ventricles relax
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factors that influence arterial blood pressure
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*heart action,blood volume,resistance to flow,viscosity
***arterial pressure increases as cardiac output,blood volume,peripheral resistance and/or viscosity increases |
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control of blood pressure
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-controlled in part by mechanisms that regulate both cardiac output and peripheral resistance
-cardiac output depends on amount of blood discharged from ventricle with each beat and heart rate |
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pulmonary circut
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consists of the vessels that carry blood from r. ventricle to the lungs,alveolar capillaries and the vessels that lead back to L.atrium
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systemic circut
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composed of vessels that leave from heart to all body parts including heart itself, excluding lungs and back to heart. it includes the aorta and it's branches as well as the veins that return blood back to the R. atrium.
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