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8 Cards in this Set
- Front
- Back
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List the 3 major determinants of cardiac function.
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1) Preload
2) Afterload 3) Contractility |
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Preload is also known as
a) Wall tension b) myocardial fibril shortening c) LVEDV |
c) LVEDV
stretch of the left ventricle |
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Define preload
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The volume in the left ventricle at the end of diastole or the relaxation period of the left ventricle
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Define afterload
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Wall tension of the left ventricle as the left ventricle contracts during systole
Resistance that has to be overcome to promote forward flow from the left ventricle into the aorta and then systemically to perfuse vital organs |
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Define contractility
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Intrinsic characteristic of heart muscle; the shortening of cardiac myofibrils during the systolic contracting phase of the left ventricle
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What is the primary pacemaker of the heart
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SA node
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Where is the SA node located?
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At the junction of the SVC (superior vena cava) as it enters the right atrium
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List 2 other factors that influence cardiac function other than the primary determinants of preload, afterload, and contractility.
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1) Heart rate
2) Heart rhythm |
