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 atrioventricular valve between the left atrium and the left ventricle is called the bicuspid valve (also known as the mitral valve), and the atrioventricular valve between the right atrium and the right ventricle is called the tricuspid valve.
The cords that attach the valve edges to the ventricle wall are called Chordae tendineae and are sometimes called heart srtings. When the right ventricle of the heart contracts, the blood pressure will push on the tricuspid valve-this stops the blood flowing into the right atria.