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Velocity of Signal Conduction in Cardiac Muscle

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Velocity of Signal Conduction in Cardiac Muscle

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Questions and Answers

What is the velocity of signal conduction in cardiac muscle fibers?

5 to 6 m/sec

10 to 12 m/sec

1 to 2 m/sec

0.3 to 0.5 m/sec (correct)

How does the velocity of signal conduction in cardiac muscle fibers compare to that in very large nerve fibers?

Approximately 1/100

Approximately 1/10

Approximately 1/50

Approximately 1/250 (correct)

What is the velocity of conduction in the specialized heart conduction system (Purkinje fibers)?

6 m/sec

4 m/sec (correct)

8 m/sec

10 m/sec

What characterizes the refractory period of cardiac muscle?

It is the interval of time during which restimulation cannot occur. Signup and view all the answers

What is the normal refractory period of the ventricle in cardiac muscle?

0.25 to 0.30 second Signup and view all the answers

What is the main function of excitation-contraction coupling in muscle cells?

To cause the muscle fibers to contract Signup and view all the answers

How does the refractory period of atrial muscle compare to that of ventricles?

Shorter in atrial muscle Signup and view all the answers

What is the role of calcium ions in the excitation-contraction coupling of cardiac muscle?

Promote sliding of actin and myosin filaments Signup and view all the answers

How does the action potential spread within a cardiac muscle fiber?

Through membranes of transverse (T) tubules Signup and view all the answers

Which structure releases calcium ions into the muscle sarcoplasm in cardiac muscle cells?

Sarcoplasmic reticulum Signup and view all the answers