The axon terminals of nerves contains

Options

A. Vesicles filled with neurotransmitters
B. Vesicles filled with calcium ions
C. Nissl's granules
D. Vesicles filled with neurohormones

Answer

To answer the question "The axon terminals of nerves contain," we will break down the information step by step.

### Step-by-Step Solution:

1. **Understanding Axon Terminals**:
- Axon terminals are the endpoints of an axon where the neuron communicates with other neurons or target cells.
- They play a crucial role in transmitting signals across synapses.

2. **Vesicles in Axon Terminals**:
- Axon terminals contain small structures called vesicles.
- These vesicles are essential for the storage and release of neurotransmitters.

3. **Neurotransmitters**:
- Neurotransmitters are chemical messengers that transmit signals across a synapse from one neuron to another.
- Common neurotransmitters include dopamine, serotonin, acetylcholine, and norepinephrine.

4. **Release Mechanism**:
- When an action potential reaches the axon terminal, it triggers the vesicles to fuse with the presynaptic membrane.
- This fusion leads to the release of neurotransmitters into the synaptic cleft (the small gap between neurons).

5. **Conclusion**:
- Therefore, the axon terminals of nerves primarily contain vesicles filled with neurotransmitters.

### Final Answer:
The axon terminals of nerves contain vesicles filled with neurotransmitters.

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