Human heart is

Options

A. Myogenic
B. Neurogenic
C. Venous
D. Both (1) & (2)

Answer

To answer the question "Human heart is...", we need to analyze the options provided: myogenic, neurogenic, venous, and both 1 & 2.

### Step-by-Step Solution:

1. **Understanding Myogenic and Neurogenic**:
- **Myogenic**: This term refers to the origin of the heartbeat being generated by the muscle itself. In a myogenic heart, the contraction is initiated by specialized muscle cells.
- **Neurogenic**: This term indicates that the heartbeat is initiated by nerve impulses from the brain or nervous system. In a neurogenic heart, the contraction is triggered by signals from nerves.

2. **Identifying the Nature of the Human Heart**:
- The human heart is classified as myogenic. This means that the heart's contractions are initiated by the heart muscle itself rather than by nerve signals.

3. **Role of the Sinoatrial Node**:
- The sinoatrial (SA) node, located in the right atrium of the heart, is responsible for generating electrical impulses that trigger heart contractions. This node has an inherent ability to create a wave of contraction, effectively controlling the heartbeat.
- Because the SA node initiates the contraction of the heart muscle, it is often referred to as the "pacemaker" of the heart.

4. **Conclusion**:
- Since the human heart's contractions are initiated by the SA node and the muscle itself, we conclude that the human heart is myogenic in nature.

### Final Answer:
The human heart is **myogenic**.

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