Truncus arteriosus receives blood from

Options

A. Right auricle
B. Left auricle
C. Ventricle
D. Venae cavae

Answer

**Step-by-Step Solution:**

1. **Understanding Truncus Arteriosus**: The truncus arteriosus is a major vessel in the heart that plays a crucial role in the circulatory system. It is essential to know its origin to answer the question correctly.

2. **Origin of Truncus Arteriosus**: The truncus arteriosus arises from the right ventricle of the heart. This is a key point because it directly relates to where it receives blood.

3. **Function of the Semilunar Valve**: There is an opening between the right ventricle and the truncus arteriosus, which is guarded by a semilunar valve. This valve allows blood to flow from the ventricle into the truncus arteriosus while preventing backflow into the ventricle.

4. **Blood Flow During Contraction**: When the ventricles contract, the semilunar valve opens, allowing blood to flow into the truncus arteriosus. This process ensures that the truncus arteriosus is filled with blood coming from the right ventricle.

5. **Conclusion**: Based on the information gathered, we conclude that the truncus arteriosus receives blood from the right ventricle. Therefore, the correct answer to the question is option 3: "ventricle."

**Final Answer**: Truncus arteriosus receives blood from the ventricles (Option 3).

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