Heartbeat in vertebrates is

Options

A. Neurogenic
B. Myogenic
C. Both
D. None

Answer

To solve the question "Heartbeat in vertebrates is," we need to understand the two types of hearts: neurogenic and myogenic. Let's break it down step by step.

### Step-by-Step Solution:

1. **Understand the Types of Hearts**:
- There are two main types of hearts: Neurogenic and Myogenic.
- **Neurogenic Heart**: This type of heart is controlled by nerves that originate from the brain. The contraction of the heart is initiated by these nerve signals.
- **Myogenic Heart**: In this type, the contraction is initiated by the cardiac muscle cells themselves, without the need for nerve signals.

2. **Characteristics of Myogenic Heart**:
- Myogenic hearts are characterized by the intrinsic ability of cardiac muscle cells (myocytes) to generate electrical impulses that trigger contractions.
- This type of heart is typical in vertebrates, including humans.

3. **Examples of Myogenic Heart**:
- The human heart is a prime example of a myogenic heart. Since humans are vertebrates, this reinforces the classification of the heartbeat in vertebrates as myogenic.

4. **Conclusion**:
- Given the definitions and characteristics of both types of hearts, we can conclude that the heartbeat in vertebrates is primarily myogenic. This is because the heart's contractions are regulated intrinsically by specialized cardiac muscle cells.

5. **Final Answer**:
- The correct answer to the question "Heartbeat in vertebrates is" is **Myogenic**.