The heart beat of which animal is myogenic in nature

Options

A. Cockroach
B. Leech
C. Elephant
D. All of these

Answer

### Step-by-Step Solution:

1. **Understanding Myogenic Heartbeat**:
- Myogenic refers to the heartbeat being initiated and regulated by the muscle tissue itself, rather than by nerve impulses. This means that the heart's contractions are generated by the heart muscle cells.

2. **Identifying Vertebrates**:
- Myogenic heartbeat is characteristic of all vertebrates. Vertebrates include animals such as mammals, birds, reptiles, amphibians, and fish.

3. **Focus on Mammals**:
- Since mammals are a subset of vertebrates, their heartbeats are also myogenic. This includes a wide range of animals, including humans, elephants, dogs, and many others.

4. **Exclusion of Invertebrates**:
- In contrast, invertebrates (like cockroaches and leeches) have hearts that are controlled by neural mechanisms. This means their heartbeat is regulated by the nervous system rather than by the muscle tissue itself.

5. **Conclusion**:
- Therefore, the heart of animals such as elephants (which are mammals) is myogenic in nature. The correct answer to the question is that the heartbeats of vertebrates, including mammals like elephants, are myogenic.

### Final Answer:
The heartbeat of animals such as elephants is myogenic in nature.