Three chambered heart of frog is not as efficient as four chambered human heart because

Options

A. oxygenated and deoxygenated bloods mix up
B. ventricle does not pump blood properly
C. it does not hold enough blood
D. heart muscles are not strong

Answer

### Step-by-Step Solution:

1. **Understanding the Structure of the Frog's Heart**:
- The frog has a three-chambered heart consisting of two atria and one ventricle. This structure allows for some mixing of oxygenated and deoxygenated blood.

2. **Comparison with the Human Heart**:
- In contrast, the human heart has four chambers: two atria and two ventricles. This separation allows for complete segregation of oxygenated and deoxygenated blood.

3. **Inefficiency of the Frog's Heart**:
- The mixing of oxygenated and deoxygenated blood in the frog's heart leads to less efficient oxygen delivery to the body. This is because the oxygen-rich blood is diluted with oxygen-poor blood.

4. **Role of the Ventricle**:
- While the ventricle in a frog's heart does pump blood, it does so less efficiently than the human heart. The human heart's design allows for more effective pumping of blood to the lungs and the rest of the body.

5. **Conclusion**:
- The primary reason the frog's heart is less efficient than the human heart is due to the mixing of oxygenated and deoxygenated blood, which reduces the overall oxygen supply to the body.

### Final Answer:
The three-chambered heart of a frog is not as efficient as the four-chambered human heart because oxygenated and deoxygenated blood mix up.

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