Chapter 13 Test: Cardiovascular System

Which layer of the heart wall is responsible for actual pumping action?

• Endocardium

• Epicardium

• Myocardium

• Pericardium

The cardiac conduction system's primary pacemaker is the:

• AV node

• Purkinje fibers

• Bundle of His

• Sinoatrial (SA) node

During the cardiac cycle, which event occurs first?

• Ventricular systole

• Atrial systole

• Ventricular diastole

• Complete heart relaxation

Which component of the ECG represents ventricular depolarization?

• P wave

• QRS complex

• T wave

• U wave

The force preventing backflow of blood into the atria is created by:

• Semilunar valves

• Chordae tendineae

• Papillary muscles

• Aortic sinuses

Which blood vessels have the thinnest walls?

• Arteries

• Arterioles

• Capillaries

• Veins

Precapillary sphincters are controlled primarily by:

• Nervous system

• Oxygen concentration

• Blood pressure

• Hormone levels

Which process moves substances between capillaries and tissue fluid?

• Active transport only

• Filtration, diffusion, and osmosis

• Phagocytosis

• Pinocytosis

Veins differ from arteries primarily in:

• Having no endothelial lining

• Thinner muscular walls

• Lack of valves

• Complete absence of connective tissue

Blood pressure is directly proportional to:

• Cardiac output

• Peripheral resistance

• Blood volume

• All of the above