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 Atrioventricular (AV) valves include. 2  Mitral valve located between left atrium and left ventricle. 3  and tricuspid valve which separates right atrium from right ventricle. 4  Reduces the volume of atria and increases pressure.