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15 Cards in this Set
- Front
- Back
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Layers of Heart
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Epicardium outer
Myocardium middle Endocardium |
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1. Filling
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Atria ventricles relaxed
Mitral tricuspid valves open Diastole |
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2. Systole
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Atria contracts
Ventricles fill completely |
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3. Ventriclular systole
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ventriclular contraction
no change in volume |
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4. Ejection
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Ventricle pressuree high
Semilunar valves open |
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5. Insovlumic relaxation
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Pulmonary arteries and aorta high
no change in volume |
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myocardial contratility
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defines force of conraction for a single cardiac muscle and venricals at end diastolic volume
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Starlings Law of Heart
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increce force contraction as muscle fivers strech
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Heart rate
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normal 70 beats per min.
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Sympatihc Stimulation of Sinus node
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heart rate increases
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Sympatic Myocardium stimulaiton
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increaces force of contraction of myocardium
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Sympatic NE
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B-adreneric in pacemaker
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Parasympatic Heart Rate contraction
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slows at SA node
no effect on contraction |
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Parasympatic ACH
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releaced at nictoinc
receptors at musacrine |
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Atropine
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blocks musacrine recptors
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