Question

Q1. The PR interval represents: A. The action potential Pleateau B. The duration of the action...

Q1. The PR interval represents:

A. The action potential Pleateau

B. The duration of the action potential

C. Ventricle refractory period

D. Crossing over the AV node

Q2. The electrical axis of the heart corresponds to:

A. The conduction of the heart

B. The cardiac contractile cell action potential

C. The cardiac nodal cell action potential

D. The orientation of the heart

Q3. Which of the following is not a type of cardiac cell?

A. Myoblast

B. Nodal Cell

C. Contractile Cell

D. Conducting fibers

Science   Anatomy-And-Physiology   
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Homework Answers

Answer #1

1) D) Crossing over the AV node

Explanation: P wave is the duration at which cardiac action potential has been generated and spread to the atrium causing atrial depolarization and contraction. PR interval is the duration at which the action potential reaches the AV node where AV nodal delay to action potential occurs.

2. A) conduction of the hear

Explanation: Cardiac axis is determined by the number and duration of cardiac fibers depolarized at a given instant. It describe the conduction of action potential in a particular direction through the heart.

3. A. Myoblast

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