The Cardiovascular System 11-2

The length of the cardiac cycle is normally ____ seconds (s) in length.

• 2

• 4

• 0.8

• 0.3

The electrocardiogram (ECG) wave that results from the firing of the sinoatrial (SA) node is the ____ wave.

• QRS

• T

• P

• S-T

The first heart sound, "lub," is caused by the closure of the ____ valves.

The term that means heart contraction is ____.

During mid-to-late diastole, blood flows from the atria to the ____.

The average heart beats about ____ times per minute.

The volume of blood pumped out of the ventricle with each heartbeat is known as ____.

The vagus nerve operates under the control of the parasympathetic nervous system and causes the ____.

• heart rate to decrease

• heart rate to increase, then decrease

• heart rate to increase

• blood pressure to increase

Which of the following represents the correct path for the transmission of an impulse in the intrinsic conduction system of the heart?

• AV node, SA node, AV bundle, right and left bundle branches, Purkinje fibers

• AV node, AV bundle, SA node, Purkinje fibers, right and left bundle branches

• SA node, AV bundle, AV node, Purkinje fibers, right and left bundle branches

• SA node, AV bundle, AV node, right and left bundle branches, Purkinje fibers

• SA node, AV node, AV bundle, right and left bundle branches, Purkinje fibers

Which vessel carries deoxygenated blood from cardiac circulation to the right atrium of the heart?