exists and is an alternate of . Direct observation means looking at it with your own two eyes, feeling it with your fingers (or other body parts), directly hearing it with your ears or directly tasting it with your tongue. Indirect observation means not sensing the object of observation directly but by observing the effects it has on its surroundings.
The right atrioventricular valve is the tricuspid valve. The left atrioventricular valve is the bicuspid, or mitral, valve. The valve between the right ventricle and pulmonary trunk is the pulmonary semilunar valve.
1 Between each chamber of the heart are valves which prevent the blood being forced back into the chamber from which it was just pushed out. 2  Between the atria and the ventricles are the tricuspid and mitral valves (mitral is on the left and tricuspid on the right). 3  These are known as the atrioventricular valves.