Ch. 20 Heart Review

What is incorrect concerning the blood flow within the heart?

• Blood flows from the atria to the ventricles

• Blood flows from the ventricles to the vessels

• Blood flows from the ventricles though the AV valves

• All of these are correct

T/F: The conduction system of the heart involves the SA node, AV node, Bundle of His, and Purkinje fibers.

• True

• False

T/F: An action potential of the cardiomyocytes occur first then contraction can occur.

• True

• False

What is incorrect concerning the action potential of myocardiocytes?

• Depolarization occurs when sodium enters

• Repolarization occurs when potassium enters

• Plateau occurs when calcium enters

• All of these are correct

Which is incorrect concerning the EKG?

• P wave - atrial depol/systole

• QRS wave - ventricular depol/systole

• T wave - ventricular repol/diastole

• All of these are correct

T/F: Isovolumetric contraction is when there is no change in volume of the ventricles but the heart is still contracting

• True

• False

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