Heart

The inferior chambers of the heart are the

Ventricles

The papillary muscles attach to the cusps of the atrioventricular valves by means of the

Chordae tendineae

The atria are separated from the ventricles externally by the

Coronary sulcus

The cell-to-cell contacts of the cardiac muscle fibers are called

Intercalated discs

The base of the heart is formed primarily by the

Left atrium

Which valve prevents the backflow of blood into the left ventricle when the ventricles relax?

a. Aortic semilunar valve b. Right atrioventricular valve c. None of these answers is correct d. Left atrioventricular valve e. Pulmonary semilunar valve

Which action causes the closure of the right atrioventricular valve?

a. Contraction of the right ventricle b. Contraction of the right atrium c. None of these answers is correct d. Contraction of the left atrium e. Contraction of the left ventricle

Which pair is located more anteriorly in a heart in normal position?

a. Left atrium and right ventricle b. Right atrium and left atrium c. Left atrium and left ventricle d. Right atrium and right ventricle e. Right atrium and left ventricle

Which structure marks the end of the left ventricle and the entrance to the aorta?

a. Right atrioventricular valve b. Foramen ovale c. Aortic semilunar valve d. Left atrioventricular valve e. Pulmonary semilunar valv

Which heart chambers pump deoxygenated blood?

a. Right atrium and left ventricle b. Left atrium and left ventricle c. Right atrium and right ventricle d. Left ventricle and right ventricle e. Left atrium and right atrium