Heart of Rabit does not have`:-`

Options

A. Right auricle
B. Sinus venosus
C. Conus arterious
D. Both 2 & 3

Answer

To solve the question "Heart of Rabbit does not have:", we need to analyze the options provided and understand the anatomy of the rabbit heart.

### Step-by-Step Solution:

1. **Identify the Options**: The options given are:
- A) Right oracles
- B) Sinus venosus
- C) Conus arteriosus
- D) Both B and C

2. **Understand Rabbit Heart Anatomy**:
- The rabbit heart is a four-chambered heart, similar to that of humans, consisting of two atria and two ventricles.
- In lower vertebrates like frogs, the heart has structures such as the sinus venosus and conus arteriosus, which are not present in mammals.

3. **Analyze Each Option**:
- **A) Right oracles**: The rabbit heart does have right oracles (auricles), which are parts of the atria.
- **B) Sinus venosus**: This structure is present in the embryonic stage but is incorporated into the right atrium in adult rabbits. Thus, it is not a distinct structure in the adult rabbit heart.
- **C) Conus arteriosus**: This is also not present in the rabbit heart; instead, the pulmonary trunk arises directly from the right ventricle.
- **D) Both B and C**: Since both the sinus venosus and conus arteriosus are not present in the adult rabbit heart, this option is also valid.

4. **Conclusion**: Based on the analysis, the correct answer is **D) Both B and C**. The heart of the rabbit does not have the sinus venosus and the conus arteriosus.

### Final Answer:
The heart of the rabbit does not have: **Both B (Sinus venosus) and C (Conus arteriosus)**.

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