21) The right ventricle pumps blood to the

A) left atrium.

B) left ventricle.

C) lungs.

D) systemic circuit.

E) right atrium.

22) Small tributaries from the branches of the coronary arteries form interconnections called ________.

A) infarcts

B) auricles

C) regurgitations

D) trabeculae carneae

E) anastomoses

23) When arteries connect to one another, it is called an arterial ________.

A) sinus

B) sac

C) mediastinum

D) sulcus

E) anastomosis

24) The first blood vessels to branch from the pulmonary trunk are the

A) pulmonary arteries.

B) bronchial arteries.

C) circumflex arteries.

D) carotid arteries.

E) subclavian arteries.

25) The primary function of the venae cavae includes which of the following?

A) return blood to the right atrium

B) pump oxygenated blood into circulation

C) remove excess fluid from the heart chambers

D) anchor the heart to surrounding structures

E) prevent expansion of the heart

26) The atrioventricular valve on the left side of the heart is often called the

A) tricuspid valve.

B) cuspid valve.

C) mitral valve.

D) pulmonary valve.

E) aortic valve.

27) Which of the following indicates the start of the systemic circuit?

A) pulmonary trunk

B) pulmonary arteries

C) vena cavae

D) ascending aorta

E) cardiac veins

28) The semilunar valve of the left side of the heart prevents backflow from the

A) aorta.

B) pulmonary trunk.

C) pulmonary veins.

D) right ventricle.

E) left ventricle.

29) The average pressure in the right ventricle is ________ the pressure in the left ventricle.

A) the same as

B) considerably lower than

C) slightly lower than

D) slightly higher than

E) much higher than

30) The function of an atrium is to

A) collect blood returning to the heart.

B) pump blood to the lungs.

C) pump blood into the systemic circuit.

D) prevent the movement of blood back into the ventricles.

E) stabilize the position of the heart valves.