The muscular ridges found on the internal surfaces of the ventricles are collectively called (the)
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.
Each cardiac muscle cell is bound to its neighboring cells at sites called
The ________ circuit carries blood to and from all parts of the body except the lungs.