The right atrium receives blood from the systemic circuit and pumps it to the
E)muscle tissue of the heart wall.
Which structural feature of the heart is a deep groove, usually filled with substantial amounts of fat, marking the border between the atria and the ventricles?
A)posterior interventricular sulcus
C)anterior interventricular sulcus
Malfunctioning chordae tendineae would
A)allow blood to flow back into the aorta and the pulmonary trunk.
B)inhibit closure of the semilunar valves.
C)cause regurgitation into the atria.
D)enable the cusps of the AV valves to swing into the ventricles.
E)block blood flow into coronary arteries.
The muscular ridges found on the internal surfaces of the ventricles are collectively called (the)