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Cardiovascular System Quiz

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Questions and Answers

What is the primary role of the sinoatrial node (SAN) in the heart?

It acts as the pacemaker of the heart. (correct)

It conducts the impulse to the atrioventricular bundle.

It blends with ordinary ventricular muscle fibers.

It serves as a blood reservoir during ventricular systole.

Which layer of the heart wall is located on the outermost side?

Pericardium

Epicardium (correct)

Myocardium

Endocardium

What causes the depolarization in the action potential of cardiac muscle?

Increased permeability to sodium ions. (correct)

A transient change in resting membrane potential.

Reactivation of the sodium-potassium pump.

Increased permeability to calcium ions.

What function do the atria perform during ventricular systole?

They act as reservoirs for blood. Signup and view all the answers

Which statement correctly describes the function of the AV bundle of His?

It is the only muscular connection between the atria and the ventricles. Signup and view all the answers

What is the primary function of the ventricles in the heart?

Pump blood into the aorta and pulmonary artery Signup and view all the answers

Which property of cardiac muscle allows it to respond to an adequate stimulus?

Excitability Signup and view all the answers

Which statement about the autonomic innervation of cardiac muscle is true?

The right vagus nerve supplies the sinoatrial node Signup and view all the answers

What is the significance of intercalated discs in cardiac muscle?

They connect cardiac myocytes and allow action potentials to travel with low resistance Signup and view all the answers

Which term describes the ability of cardiac muscle fibers to generate regular impulses without neural stimulation?

Myogenic rhythmicity Signup and view all the answers