Question

Match the following -

Location	valves
1. Opening of coronary sinus	a) Tricuspid valve
2. The base of pulmonary aorta	b) Bicuspid valve
3. The opening of inferior vena cava	c) Semilunar valve
4. Bet left atrium and left ventricle	d) Thebesian valve
5. Bet right atrium and right ventricle	e) Eustachian valve

Answer 1

Prior to leaving each chamber of the heart, blood passes through a valve. The valves keep blood from flowing backward. In fact, valves are flaps (leaflets) that serve as one-way blood inlets entering the ventricle and one-way blood outlets leaving the ventricle.

Complete answer:

Location	Valve

1. The opening of a coronary sinus| d) Thebesian valve
2. The base of a pulmonary aorta| c) Semilunar valve
3. An opening of inferior vena cava| e) Eustachian valve
4. Between left atrium and left ventricle| b) Bicuspid valve
5. Between right atrium and right ventricle| a) Tricuspid valve

Additional information:
Four chambers, two atria (upper chambers), and two ventricles (lower chambers) form the nucleus. Before leaving each chamber of the heart, there is a valve through which blood passes. The valves keep blood from flowing backward. These valves are actual flaps situated on either end of the two (lower chambers of the heart) ventricles. They serve as one-way blood inlets on one side of the ventricle and one-way blood exits on the other side of the ventricle. There are three flaps in normal valves, except the mitral valve, which has two flaps. The following are found in the four heart valves:
Tricuspid valve: between the right atrium and the right ventricle, located
Pulmonary valve: situated between the pulmonary artery and the right ventricle
Mitral valve: situated between the left ventricle and the left atrium
Aortic valve: situated between the aorta and the left ventricle

Note:
-The valves open and close as the heart muscle contracts and relaxes, letting blood flow into the ventricles and atria at alternating times. The following is a step-by-step example of how the valves in the left ventricle work normally: The aortic valve closes and the mitral valve opens after the left ventricle contracts, to allow blood to flow into the left ventricle from the left atrium.
-When the left atrium contracts, more blood flows into the left ventricle. The mitral valve closes and the aortic valve opens as the left ventricle contracts, so that blood flows into the aorta.