Question

Where are the valves located in the human heart? Write their names.

Answer 1

Hint: In a human heart, the valves are like doors that allow things to pass, thus they should be present between the various compartments or the chambers to segregate them. In addition, valves should also be present in the openings of the different kinds of blood vessels in the various chambers of the heart. All the valves are named based on their unique characteristics.

Complete answer:There are several kinds of valves present in the human heart. These valves are listed as follows –
1. The Bicuspid Valve – The word Bicuspid is made up of two words, Bi which means two, and Cuspid, which means Cusps. It is also known as the Mitral Valve. This is an inlet valve. It is present in between the left auriculo-ventricular space on both sides. This means that the Bicuspid valve is present between the left auricle and the left ventricle. It is called so because it is made up of two valves thus, it has two cusps.
2. The Tricuspid Valve – The word Tricuspid is made up of two words, Tri which means three, and Cuspid, which means Cusps. This is an inlet valve. It is present in between the right auriculo-ventricular space on both sides. This means that the Tricuspid valve is present between the right auricle and the right ventricle. It is called so because it is made up of three valves thus, it has three cusps.
3. Eustachian Valve – This valve is present in the opening of the Post caval, which is the junction of the Inferior Vena cava and the Right atrium. It is present during the development and later on, it becomes very reduced, and sometimes absent in some individuals.
4. Thebesian Valve – It is present in the Coronary Sinus in the Right atrium.
5. Semilunar Valves – Two semilunar valves are present in the Pulmonary Artery and the Aorta. These valves are outlets in nature.

Note: The Haversian valve is found in the opening of the pre-caval. However, this valve is absent in humans because the blood comes with the force and the direction of gravity. Just like the Eustachian valve, the Haversian valve is also present during the development only. They exist until the two vena cavas have not separated and they mediate the flow of the blood in the Right atrium.