Question

Give an account of valves in the human heart.

SCERT Telangana Class 10 Biology Respiration

Answer 1

The valves regulate the flow of blood in one direction only i.e; from auricle to ventricle. Simply they prevent the backflow of blood in the heart.
There are four valves in the heart
1. Right auriclo-ventricular valve located between the right auricle and the right ventricle
2.Left atrio-ventricular valve located in a similar way on the left side of the heart
3.Pulmunary semilunar valves located at the opening of the right ventricle into the pulmonary artery.
4.Aortic semilunar valves located at the point of originof aorta from the left ventricle.

Answer 2

1) Heart has valves which allow the flow of blood only in one direction and prevents its flow in backward direction. Valves are held in position by tough connective tissue called chordaetendinae.

2) Right auriculo - ventricular aperture is controlled by a tricuspid valve which allows the blood flow from right auricle to right ventricle.

3) Left auriculo - ventricular aperture is provided with bicuspid valve which controls the blood flow from left auricle to left ventricle.

4) At the origin of pulmonary aorta in the right ventricle three half moon shaped or semilunar valves present which allow the blood to flow from right ventricle into

pulmonary aorta.

5) At the origin of systemic aorta in the left ventricle there are three semilunar aortic valves which allow the blood flow from left ventricle into the aorta.