Heart

Right atrium

A

SA node.

A

Damage to the ________ is referred to as heart block.

AV node

Which of the following is not part of the conduction system of the heart? AV node bundle of His Correct AV valve SA node

AV valve

AV node.

B

Tricuspid valve.

B

AV bundle.

C

Pulmonary veins

C

Normal heart sounds are caused by which of the following events? excitation of the SA node closure of the heart valves friction of blood against the chamber walls opening and closing of the heart valves

Closure of the heart valves

Bundle branches.

D

Mitral valve.

D

Left ventricle.

E

Purkinje fibers.

E

An ECG provides direct information about valve function.

False

The papillary muscles contract after the other ventricular muscles so that they can take up the slack on the chordae tendineae before the full force of ventricular contractions sends blood against the AV valve flaps.

False

Blood within the pulmonary veins returns to the ________.

Left Atrium

Small muscle masses attached to the chordae tendineae are the ________.

Papillary Muscles

Which vessel of the heart receives blood during right ventricular systole?

Pulmonary Trunk

Select the correct statement about the heart valves. The mitral valve separates the right atrium from the right ventricle. The tricuspid valve divides the left atrium from the left ventricle. Aortic and pulmonary valves control the flow of blood into the heart. The AV valves are supported by chordae tendineae so that regurgitation of blood into the atria during ventricular contraction does not occur.

The AV valves are supported by chordae tendineae so that regurgitation of blood into the atria during ventricular contraction does not occur.

The left side of the heart pumps the same volume of blood as the right.

True

The myocardium receives its blood supply from the coronary arteries.

True

Trabeculae carneae are found in the ventricles and never the atria.

True

The P wave of a normal electrocardiogram indicates ________.

atrial depolarization

Which of these vessels receives blood during ventricular systole?

both the aorta and pulmonary trunk

The source of blood carried to capillaries in the myocardium would be the ________.

coronary arteries

If cardiac muscle is deprived of its normal blood supply, damage would primarily result from ________.

decreased delivery of oxygen

The left ventricular wall of the heart is thicker than the right wall in order to ________.

pump blood with greater pressure

The fact that the left ventricle of the heart is thicker than the right ventricle reveals that it ________.

pumps blood against a greater resistance

Isovolumetric contraction ________.

refers to the short period during ventricular systole when the ventricles are completely closed chambers

To auscultate the aortic semilunar valve, you would place your stethoscope in the ________.

second intercostal space to the right of the sternum

The tricuspid valve is closed ________. while the ventricle is in diastole when the ventricle is in systole while the atrium is contracting by the movement of blood from atrium to ventricle

when the ventricle is in systole