Heart Conduction and ECG

If the P wave on an ECG looks abnormal, which structures in the heart are likely damaged?

• SA/AV node

• Aortic valve

• Bundle of His

• Purkyne fibers

The P-wave correlates with which event?

• atrial depolarization

• ventricle depolarization

• ventricle repolarization

• atrial repolarization

What does depolarization result in?

• relaxation

• contraction

• repulsion

• attraction

An electrocardiogram measures what?

• The amount of pressure exerted on blood vessels.
• The electrical activity of the heart.
• How many times the heart contracts over time.
• The body's temperature caused by friction of blood in vessel.

What is going on in the heart during the R-wave or QRS complex

• SA node triggers depolarization in atria

• AV node triggers depolarization in ventricles, the main pumping action

• Delay caused by the SA node

• Repolarization of the ventricles

What is going on in the heart during the T-wave

• SA node triggers depolarization in atria

• AV node triggers depolarization in ventricle, the main pumpung action

• Delay caused by the SA node

• Repolarization of the ventricles

Intrinsic electrical impulses start at which of the following locations?

• AV Node

• Bundle of His

• Purkyne fibres

• SA Node

Which of the following is most likely to occur if there is a blockage to the AV bundle nerve impulse?

• the AV Node will not produce electrical impulses

• the SA Node will not produce electrical impulses

• no effect

• the Purkyne fibres will not produce electrical impulses

The pacemaker of the heart is the

• AV node

• SA node

• Bundle of His

• Purkyne fibres

Tags

NGSS.HS-LS1-3

Which is the correct path of electrical impulses through the heart?

• SA → Purkyne Fibres → Bundle Branches → AV

• SA → AV → Bundle Branches → Purkyne Fibres

• AV → SA → Bundle Branches → Purkyne Fibres

• AV → Bundle Branches → SA → Purkyne Fibres