circulation test pt 2

Question 1

The structures attached to the atrioventricular valves are called

Answer 1

chordae tendineae.

Question 2

The main function of the valves in the heart is to

Answer 2

prevent back-flow of blood.

Question 3

Blood leaves the right ventricle via the

Answer 3

pulmonary trunk.

Question 4

An irregular heartbeat where contraction of the atria does not always result in contraction of the ventricles, likely indicates a problem with the

Answer 4

AV node.

Question 5

A condition called tachycardia exists when a person’s heart rate is abnormally high. Which of the following explains how tachycardia may arise?

Answer 5

The sinoatrial (SA) node is receiving increased stimulation.

Question 6

The atrioventricular (AV) node stimulates the

Answer 6

Purkinje fibers

Question 7

The coordinating structure responsible for an intrinsic heart beat is the

Answer 7

sinoatrial node

Question 8

What happens during atrial diastole?

Answer 8

Atria fill with blood.

Question 9

Use the following information to answer the question.
1. Systole of the ventricles.
2. Opening of the atrio-ventricular valves.
3. Electrical impulse sent from the SA node.
4. Atria fill with blood.
The order in which the events above occur during one heartbeat (the cardiac cycle) is

Answer 9

4, 3, 2, 1
Atria fill with blood.
Electrical impulse sent from the SA node
Opening of the atrio-ventricular valves.
Systole of the ventricles.

Question 10

The blood vessels that carry blood to and from the head are the

Answer 10

Carotid arteries and jugular veins.

Question 11

The path followed by blood on one circuit through the heart is

Answer 11

atrium, atrioventricular valve, ventricle, semilunar valve.