Question

A red blood cell, entering the right side of the heart passes by or through the following structures.
1. Atrioventricular valves
2. Semilunar valves
3. Right atrium
4.Right ventricle
5. SAN
Which of the following options represents the correct sequence?

• A. 2 -> 3 -> 1 -> 4 -> 5
• B. 3 -> 1->5->2->4
• C. 3->5->1->4->2
• D. 5->3->1->4->2

Answer 1

The correct option is C 3->5->1->4->2

Pathway of blood through the heart

1. Blood enters the right atrium from the superior and inferior venae cavae,

and the coronary sinus.

2. From right atrium, it goes through the tricuspid valve to the right ventricle.

3. From the right ventricle, it goes through the pulmonary semilunar valves to

the pulmonary trunk.

4. From the pulmonary trunk, it moves into the right and left pulmonary

arteries to the lungs.

5. From the lungs, oxygenated blood is returned to the heart through the

pulmonary veins.

6. From the pulmonary veins, blood flows into the left atrium.

7. From the left atrium, blood flows through the bicuspid (mitral) valve into

the left ventricle.

8. From the left ventricle, it goes through the aortic semilunar valves into the

ascending aorta.

9. Blood is distributed to the rest of the body (systemic circulation) from the

aorta.

Thus, the correct answer is '3->5->1->4->2'