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18 Cards in this Set
- Front
- Back
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Circulation |
functions to supplythe body with oxygen & nutrients and to remove wastes. |
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size of heart |
9 cm x 14 cm Varieswith body size |
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location of heart |
behind sternum,between lungs, protected within thoracic cage |
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Layers of the pericardium |
visceralpericardium -thin, serous inner covering parietal pericardium-thick, outer sac pericardial cavity-filled with serous fluid |
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heart wall(3) |
i) epicardium -outer,protective layer ii) myocardium -muscularlayer iii) endocardium-continuous with blood vessels |
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arteries |
bloodvessels which carry blood away from the heart |
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arterioles |
smallerbranches off of arteries |
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metaarterioles |
metaarterioles |
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capillaries |
-walled;connections between the smallest arteries & veins |
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arteriovenousshunts |
connectionbetween arterial & venous pathways that do not involve the capillarynetwork |
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capillaryarrangement - |
dependsupon metabolic needs of the tissues. Increased metabolism equals increased capillaries |
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capillaryblood flow regulation |
precapillarysphincter (muscle "ring") |
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capillaryexchange |
byfiltration & passive processes (1) gases (2) nutrients (3) wasteproducts |
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Veins |
carryblood toward the heart. Veinscontain valves |
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systolicpressure |
maximumpressure at ventricular contraction (Normalpressure 120/80 – represents an average for adults) |
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diastolicpressure |
minimumpressure at ventricular diastole Normalpressure 120/80 – represents an average for adults |
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pressuredepends upon: (4) |
i) heartaction ii) bloodvolume iv) viscosity- thickness or thinness of blood |
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vasomotorfibers |
vasodilation(acetylcholine) and vasoconstriction (norepinephrine) |
