Purkinje fibers are:

1.	Intrinsic neural fibers in the ventricles
2.	Muscle fibers that interconnect SA node and AV node
3.	Muscle fibers that are distributed in the ventricular musculature
4.	Neural fibers that spread the impulse throughout the ventricular muscle mass

All the following statements regarding joint diastole phase of the cardiac cycle are correct except:

The first heart sound is heard during the:
1. Beginning of ventricular systole
2. End of ventricular systole
3. Beginning of atrial systole
4. End of ventricular diastole

When the stroke volume of the ventricles is much less than the expected values, the heart is said to be:
1. Fibrillating
2. Blocked
3. Arrested
4. Failing

A trained athlete can achieve a maximal cardiac output of:

The atria receive:

On a surface ECG, the end of ventricular systole is marked by:

Normal activities of the human heart are regulated:
1. Intrinsically
2. By the autonomic nervous system
3. By the somatic neural system
4. By the adrenal medullary hormones

A normal blood pressure reading in a healthy adult human being would be:

A tricuspid valve will prevent flow of blood from:
1. Right atrium to right ventricle
2. Right ventricle to right atrium
3. Left atrium to left ventricle
4. Left ventricle to left atrium