Question

In APA format of 250 Explain the purpose of the four heart valves,and describe their structure and locations.

Answer 1

There are 4 valves in human heart. Two are between atria and ventricles and these are called atrioventricular valves. The other two are semilunar valve, which are present at the opening of blood vessels arising from ventricles, namely systemic aorta and pulmonary aorta.

The function of valves is to permit the flow of blood only in one direction.

Left atrioventricular valve is also called mitral or bicuspid valve. It is formed by two cusps .

Right atrioventricular valve is also called tricuspid valve and it is made up of three cusps. Cusps of the valves are attached to the papillary muscles by means of chordae tendineae. Papillary muscles play an important role in closure of cusps and in preventing the back flow of blood from ventricles to atria during ventricular contraction.

Atrioventricular valves open only towards ventricles and prevent the backflow of blood into atria.

Semilunar valve are present at the opening of systemic aorta and pulmonary artery and are known as aortic and pulmonary valve respectively. They are of half moon shaped. These are made up of 3 flaps.

Semilunar valves open only towards the aorta and pulmonary artery and prevent teh backflow of blood into teh ventricles.