Nerve fibres transmit the nerve message by _____means.

Options

A. chemical
B. physical
C. electrochemical
D. electrical

Explanation

To answer the question "Nerve fibres transmit the nerve message by _____ means," we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Nerve Transmission**: Nerve fibres are responsible for transmitting messages in the form of nerve impulses. These impulses are electrical signals that travel along the nerve fibres.

2. **Identifying the Gap**: Between two neurons, there is a small gap known as the synaptic cleft. This gap is approximately 200 angstroms wide.

3. **Role of Neurotransmitters**: Due to the presence of this gap, electrical signals alone cannot jump from one neuron to another. Instead, they require chemical substances known as neurotransmitters to facilitate the transmission of the nerve impulse across the synaptic cleft.

4. **Combining Electrical and Chemical Processes**: The transmission of nerve messages involves both electrical signals (the nerve impulse) and chemical signals (the neurotransmitters). Therefore, the process is termed "electrochemical."

5. **Final Answer**: Based on the understanding of how nerve fibres transmit messages, the correct answer is that nerve fibres transmit the nerve message by **electrochemical means**.