Question

Mitral valve is found between
(a) Right auricle and right ventricle
(b) Left auricle and left ventricle
(c) Right auricle and pulmonary artery
(d) Left ventricle and aorta

Answer 1

Hint: Mitral valve is a bicuspid valve meaning it comprises two cusps or flaps. The human heart is divided into four chambers i.e., right auricle, left auricle, right ventricle, and left ventricle. The right side of the heart- right auricle takes blood from all parts of the body and transfers it to the right ventricle from where it goes to the lungs so there is more pressure as compared to the left side of the heart from where purified blood is transported to all parts of the body.

Complete step by step answer:
Mitral valve is found between the left auricle and left ventricle. The Mitral valve comprises two cusps or flaps and thus it is also called a bicuspid valve. It prevents the backflow of blood from the left ventricle to the left auricle. The cusps are held in position by chordae tendineae which are inelastic tendons attached at one end to papillary muscles in the left ventricle.

So, the correct answer is `Left auricle and left ventricle`.

Additional information:
- Right auricle receives blood from all parts of the body via the inferior and superior vena cava. It passes unpurified blood to the right ventricle. The tricuspid valve is found between the right auricle and right ventricle that prevents the backflow of blood from the right ventricle to the right auricle.
- Blood is then transferred to the lungs via a pulmonary artery(unpurified blood) and it is returned to the left auricle via a pulmonary vein (purified blood).
- Purified blood is then transferred to the left ventricle. A Mitral valve or bicuspid valve is found between the left auricle and the left ventricle. Then purified blood is distributed to all parts of the body via the aorta.

Note: Chordae tendineae connects the papillary muscles to the valves in the heart. Papillary muscles are present in ventricles and they contract to prevent inversion of these valves during systole. Semilunar valves present at the base of the aorta prevents the backflow of blood into the ventricles. Thus, valves have the primary function to prevent the backflow of blood to a chamber from where it was transferred.