Cardiac Cycle
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each of the black spaces below before clicking
on it to display the answer.
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| Systole | Contraction of the heart muscles
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| Diastole | Relaxation of the heart muscles
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| Phases of contraction | Atrial systole, ventricular systole, and atrial and ventricular diastole
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| Lub | The lub sound of the heart is caused by the closure of both AV valves (bicuspid/tricuspid), this occurs at the end of atrial systole.
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| Dup | The dup sound of the heart is caused by the closure of both semilunar valves of the heart. This occurs at the end of ventricular systole.
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| HR (Heart Rate) | The number of times the heart beats in a minute.
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| SV (Stroke Volume) | The amount of blood pumped by a ventricle each time it contracts.
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| Cardiac output | Cardiac output = Heart rate X stroke volume.
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| Cardioregulatory Center | This part of the medulla oblongata, in the brain, controls how fast the heart beats. Parasympathetic signals caused the heart to slow down and sympathetic signals cause the heart rate to increase.
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| P Wave of ECG | Depolarization (Systole) of the atria
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| QRS Complex of ECG | The depolarization (Systole) of the ventricles. The atria are in diastole at this time but it is not seen on the ECG.
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| T Wave of ECG | The repolarization (Diastole) of the ventricles.
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| Ateries | Carry blood away from heart. (3 layers: tunica intima, tunica media, tunica externa)
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| Arterioles | Small arteries that can constrict and relax to distribute blood flow.
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| Cappiliaries | Microscopic blood vessels used for gas/solute exchange.
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| Veins | Carry blood toward the heart.
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| Blood Pressure | The force of blood against the walls of blood vessels.
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| Hypotension | Low blood pressure
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| Hypertension | High Blood Pressure
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Created by:
Mr.Klein
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