Question

________ chambered heart helps in the separation of the right side and the left side of the heart and is useful in mammals and birds.

• A. 2
• B. 4
• C. 6
• D. none of these

Answer 1

The correct option is B

4

The correct option is B.
Explanation of the correct option:

1. Blood circulates through the four chambers of the heart.
2. Right atrial blood flows into and via the right ventricle.
3. The blood is pumped from the right ventricle to the lungs, where it is oxygenated.
4. The pulmonary veins that enter the left atrium return the oxygenated blood to the heart.
5. However, the ventricles of birds and mammals are completely separated, giving them a true four-chambered heart.
6. The separation of low-pressure pumping to the lungs from high-pressure pumping to the remainder of the body is ensured by this design.

Explanation of the incorrect options:
Option A:

1. One atrium and one ventricle serve as the heart's two chambers, which pump blood.
2. Fish have hearts with two chambers, an atrium and a ventricle, which pump blood throughout the body.
3. While some chambers are referred to as accessory chambers, the atrium and ventricle are considered real chambers.
4. A single ventricle and a single atrium are present in two-chambered hearts.
5. The atrium serves as the conduit through which blood is pumped to the ventricle.
6. The ventricle contracts, sending the blood to a respiratory organ where it picks up oxygen.
7. The blood does not get back to the heart at this point.

Option C:

1. The aortic arch is a heart-like structure seen in earthworms.
2. Food, waste products, and breathing gases are circulated throughout the earthworm's body by this closed circulatory system.
3. The earthworm has five aortic arches that pump blood throughout its body in place of a heart.

Option D:

1. The ventricles of birds and mammals are completely septated, giving them a true four-chambered heart.
2. Option B is correct.

Final answer: 4 chambered heart helps in the separation of the right side and the left side of the heart and is useful in mammals and birds.