Units of nervous system are

Options

A. Cyton
B. Axon
C. Neuroglial cells
D. Neurons

Answer

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks for the basic units of the nervous system.

2. **Identifying the Options**: The options provided are:
- Cytone
- Axon
- Neuroglial cells
- Neurons

3. **Analyzing Each Option**:
- **Cytone**: This is another term for the cell body of a neuron. It is a part of the neuron but not a unit by itself.
- **Axon**: This is a long projection of a neuron that transmits impulses away from the cell body. It is also a part of the neuron, not a unit.
- **Neuroglial Cells**: These are non-neuronal cells that support and protect neurons. They do not transmit impulses and are not considered units of the nervous system.
- **Neurons**: These are the basic structural and functional units of the nervous system. They are responsible for transmitting impulses throughout the body.

4. **Conclusion**: The correct answer is **Neurons**, as they are the fundamental units of the nervous system responsible for communication.