Question

Blood enters the human heart

• A. Once
• B. Twice
• C. Thrice
• D. Four times

Answer 1

The correct option is B

Twice

The correct answer is option B.

Explanation of correct option:

The human heart is the most important part of the circulatory system. The heart pumps the blood throughout the body and helps in delivering oxygen and other nutrients to various parts of the body via the blood.

Human heart characteristics and functions are as follows:

1. The human heart has four chambers: two upper chambers and two lower.
2. Two upper chambers are known as the Atrium, which receives blood.
3. The lower two larger chambers are termed ventricles, which push blood out from the heart.
4. The oxygen-rich blood comes from the lungs to the left atrium.
5. The oxygen-depleted blood gets into the right atrium from different body structures.
6. Both ventricles right and left have a role in pumping the blood to the lungs and different body parts respectively.

The blood enters the heart two times i.e., from the lungs to the left atrium and into the right atrium from different body structures.

Blood enters the human heart twice.