Cardiac Cycle

Front

T or F: mechanical activity always precedes electrical activity

Back

F: electrical activity always comes first, since the action potential stimulates contraction

Front

When does the aortic valve open?

Back

When the pressure of the left ventricle exceeds the aortic pressure

Front

What does it mean for the left ventricle to be isovolumic (isometric)?

Back

That when both valves of the left ventricle are closed that no changes in volume occur

Front

What is the P-wave on an ECG?

Back

Atrial systole

Front

When does the mitral valve open?

Back

When the left atrial pressure increases and exceeds the left ventricular pressure

Front

What is the QRS complex on a ECG?

Back

Depolarization of the left ventricle

Front

What is happening to ventricular pressure as the depolarization of the left ventricle is occurring?

Back

It is increasing, while the volume remains constant

Front

What happens during rapid ejection of the heart?

Back

Ventricular volume decreases as the ventricular pressure reaches aortic pressure and forces the aortic valve open

Front

What occurs during reduced ejection?

Back

Ventricular pressure begins to drop, aortic valves close

Front

What is the dichrotic notch?

Back

Aortic pressure pulse that causes a reverse flow in the aorta as blood moves backwards to perfuse the coronary arteries