Question

what prevents backflow of blood inside heart during contraction ?

Answer 1

 a) Valves in heart

b) Thick muscular walls of ventricles

c) Thin walls of atria

d) Inner lining of the heart

Answer 2

The valves in heart helps in preventing the blood from back flow.

Explanation:

The valves which are present in the heart are tricuspid valve, pulmonary valve, aortic valve, and mitral valve.

• Tricuspid valve is positioned between right atrium and ventricle.
• Pulmonary valve is placed between the pulmonary artery and the right ventricle.
• The mitral valve is placed between left atrium and ventricle.
• The aortic valve is found between the aorta and left ventricle.