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Sequence of evens that occurs during one heartbeat.
Cardiac Cycle
Contraction of the heart muscle
Systole
Relaxtion of the heart muscle
Diastole
3 Stages of Cardiac Cycle
Artrial Systole, Ventricular Systole, Diastole
Allows the heart to pump out the same amount of blood it receives
Starling's Law Of Heart
Strengthening the force of myocardial contraction without stretching the myocardial fibers.
Inotropic Effect
Capacity to increase cardiac output above the resting cardiac output.
Cardiac Reserve
Refers to the amount of blood in the ventricle at the end of its resting phase
End-Diastolic Volume (EDV)
Amount of blood in the ventricles at the end of a disastole
Preload
Percentage of the EDV that is pumped
Ejection Fraction
Refers to resistance or opposition
Afterload
Refers to a change in heart rate
Chronotropic Effect
Refers to a change in the speed at which the cardiac impulse travels from the SA node through the AV node and the His-purkinje system
Dromotropic
What erves supply the SA and the AV nodes
Parasympathetic (vagus) nerves
Acuumulation of fluid within the lungs
Pulmonary Edema (PE)
Chest pain, due to inadequate oxygenation of the myocardium
Angina pectoris
Abnormal electrical conduction in the heart or abnormal changes in the heart rate and rhythm
Cardiac dysrhythmias
A heart defect present at birth but no necessarily hereditary.
Congenital heart defects
A commonly used term for any disease affecting the heart
Coronary heart disease
Inflammation of the layers of the heart
Inflammation of the heart
Heart attack
Myocardial infarcation (MI)
An infectious disease generally caused by Strep bacterium.
Rheumatic Feever
Dysfunction of any of the four valves.
Valvular heart disease
70 ml/beat
Stroke Volume
Stroke volume times heart rate
Cardiac Output
Phase of the cardiac cycle that refers to myocardial contraction
Systole
Phase of the cardiac cycle when the ventricles fill with blood
Diastole
Phase of the cardiac cycle that refers to myocardial relaxation.
Diastole
Change in myocardial contraction that is due to stretching of the heart muscle
Starling's law of the heart
Change in myocardial contraction that is not due to stretching of the heart mucles
Inotropic effect
Amount of blood pumped the the ventricles in one beat
Stroke volume
Amount of blood pumped by the ventricle in one minute.
Cardiac Output
Amount of blood in the ventricle at the ned of its resting place
Preload
Percentage of the end-diastolic volume pumped by the ventricle
Ejection fraction
Arteriolar constriction and hypertension cause the _______ to increase
Afterload
Forms the basis of starling's law of the heart
Preload
The effect of a drug that changes heart rate through the conduction system thereby causing a heart block
Dromotropoc effect
Same as end diastolic volume
Preload
May decline from 67% to 30& in he failing heart
Ejection fraction
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