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25 Cards in this Set
- Front
- Back
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Disease affecting the heart, peripheral blood vessels, or both
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Cardiovascular Disease
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a type of cardiovascular disease, the single largest killer of americans
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coronary heart disease
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How does the sympathetic branch affect the heart?
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affects both atria and ventricles
increases heart rate, conduction and irritability |
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How does the parasympathetic branch affect the heart?
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- affects only atria
-decreases heart rate, conduction and irritability |
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P wave represents:
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atrial depolarization
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PR segment represents:
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delay at av node
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QRS segment represents:
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ventricular depolarization
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T wave represents
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ventricular depolarization
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Isoelectric line represents:
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no electrical activity
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The heart is located in the center of the chest called the
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mediastinum
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Three layers of the heart
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endocardium - innermost
myocardium- middle layer pericardium- outer layer |
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which layer of the heart has the ability to generate and conduct electrical impulses, causing the heart to contract?
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myocardium
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The cardiac cycle consists of:
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diastole and systole
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when the heart contracts the ventricles eject about two thirds of blood it contained called:
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ejection fraction
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amount of blood ejected from the heart
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stroke volume (70ml)
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three factors that stroke volume depends on:
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preload, cardiac contractility and afterload
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this is the end diastolic volume and influences the force of the next contraction because of the stretch it exerts
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preload
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this is the resistance against which the heart muscle must pump
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afterload
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increase in peripheral vascular resistance will ______ stroke volume and vice versa
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decrease
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the more myocardial muscle is stretched, the greater its force of contraction will be
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starlings law
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HR x SV =
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cardiac output
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electrolytes that effect cardiac function
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sodium
magnesium calcium potassium chloride |
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______ plays a major role in depolarising the myocardium
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sodium
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_______ plays a role in myocardial depolarization and myocardial contraction
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calcium
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________ influences repolarization of the heart
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potassium
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