Question

To avoid the mixing of the oxygenated and deoxygenated blood, the heart has how many chambers?
a. Four
b. Two
c. Three
d. Six

Answer 1

Hint: The human heart pumps blood throughout the body. Heart functions to transport nutrients, gases, and waste products around the body, to help the body maintain a constant body temperature, to protect the body from infection and blood loss. Also to help maintain fluid balance within the body.

Complete answer:
- The heart has four chambers. They are two atria and two ventricles.
- The oxygen-less blood from the body is received by the right atrium and it is pumped to the right ventricle. And then the right ventricle pumps the oxygen-less blood to the lungs.
- The oxygen-rich blood from the lungs is then received by the left atrium and is pumped to the left ventricle. The left ventricle pumps the oxygen-rich blood to the entire body.
- The one-way valves which are present in the heart prevent the backflow of blood, so, Oxygen-rich and carbon dioxide-rich blood cannot be mixed.

Hence, the correct answer is option (A).

Additional information:
- Two chambered hearts are found in fishes. The two chambers include an atrium and a ventricle.
- Three chambered hearts are found in Amphibians. The three chambers include two atria and a single ventricle.
- Six chambered hearts are not found.

Note: From the pulmonary vein, the left side of the heart receives oxygenated blood and pumps it into the aorta. From the vena cava, the right side of the heart receives deoxygenated blood and pumps it into the pulmonary vein. From the heart to the tissues, the arteries carry oxygenated blood away. Having the exception of pulmonary arteries, which carry blood to the lungs for oxygenation.