Which of the following parts of frog's heart has spiral valve?

Options

A. Conus arteriosus
B. Synangium
C. Pylangium
D. Both (1) and (2)

Answer

To determine which part of the frog's heart has a spiral valve, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Structure of Frog's Heart**:
- The frog's heart is a three-chambered organ consisting of two atria and one ventricle. This structure is crucial for understanding the flow of blood and the presence of any valves.

2. **Identify the Relevant Parts of the Heart**:
- The main parts of the frog's heart include:
- Two atria (left and right)
- One ventricle
- Conus arteriosus (the part that leads out of the ventricle)

3. **Define the Spiral Valve**:
- The spiral valve is a structure that partially divides the conus arteriosus into two channels, which helps in directing the flow of blood to the lungs and the rest of the body.

4. **Locate the Spiral Valve**:
- The spiral valve is specifically found in the conus arteriosus, which is the part of the heart that connects the ventricle to the arteries.

5. **Evaluate the Options**:
- Given the options:
- A) Conus arteriosus
- B) Synangium
- C) Phalangium
- D) Both 1 and 2
- The correct answer is **A) Conus arteriosus**, as it is the only part that contains the spiral valve.

### Final Answer:
The part of the frog's heart that has a spiral valve is the **Conus arteriosus**.

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