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20 Cards in this Set
- Front
- Back
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Atria
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-thinner walled
-receives blood FROM systemic (R) or pulmonary (L) circulation |
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Ventricle
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-thicker walled
- distributes blood to pulmonary (R) or systemic (L) circulation |
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VALVES
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-maintains UNIdirectional flow of blood thru heart
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VALVES: atrioventricular
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valve separates atria from ventricle
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VALVES: pulmonic
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sep. R ventricle from pulmonary trunk
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VALVES: aortic
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sep. L ventricle from ASCENDING aorta
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CIRCULATION:
pulmonary |
R side of heart
sends DEoxygenated blood FROM heart TO lungs |
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CIRCULATION:
systemic |
L side of heart
sends OXYGENATED blood to ALL tissues |
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Cardiac skeleton
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1. central region of heart surrounding valves
2. dense CT, annuli fibrosae surround valves, ANCHORING cardiac muscle 3. provides support valves & great vessels |
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cardiac skeleton
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4. triangular masses b/t annuli
5. septum membranaceum--part of interventricular septum |
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heart wall
ENDOCARDIUM: inner layer |
-endothelium
-subendoth: loose CT -subendocardial--CT, nerves, conducting system of heart (purkinje fibers) |
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heart wall
MYOCARDIUM: middle layer |
-thickest
-cardiac muscle -fibrous skeleton |
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heart wall
EPICARDIUM: outer layer |
-mesothelium
-serous layer (visceral layer of pericardium) -loose CT w/ veins, nerves, AUTONOMIC GANGLIA, ADIPOSE tissue |
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Generation & Conduction of impulse for heartbeat
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via modified cardiac muscle cells, i.e. sinoatrial node
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g/c
sinoatrial node |
in wall of R atrium near entrance of superior vena cava
-cells spontaneously DEpolarize & intiate impulse |
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g/c
internodal tracts |
...connect SI node with AV node
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g/c
AV node |
inferior wall of R atrium
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g/c
IV bundle of His |
purkinje cells
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g/c
L and R bundle branches |
purkinje cells
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where do purkinje cells conduct to?
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to apex of heart where contraction is initiated
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