The neuron that transmits the impulse is called the presynaptic neuron and the cell receiving the impulse is called the postsynaptic cell.
When a nerve impulse arrives at the axon terminal of the neuron, it triggers the release of molecules called neurotransmitters.
These molecules diffuse across the synapse and bind to receptors on the next cell.
What is neuron?
- It is the structural and functional unit of nervous system.
- It is responsible for receiving and sending impulse.
The structure of neurons consists of: dendrites, cell body and axon.
- Dendrites are the hair-like structures that receives input.
- Cell body contains nucleus are cell organelles.
- Axons are long tail-like structure covered in a myelin sheet and gap between the sheet is called node of Ranvier which helps in fast transmission of signals.
- At the end of axons, many knob like structure is present called synaptic end bulb which contains neurotransmitter.
- The neuron that transmit impulse is called the presynaptic neuron.
- And the neuron receiving the impulse is called the postsynaptic neuron.
What are neurotransmitters?
- These are the chemical messengers that carry impulse from one neuron to another.
- These are present in the synaptic end bulb of an axon which is released when an impulse is transmitted.
- These then bind to the receptor present in the dendrites of adjacent neuron.
Hence, the correct answers are: presynaptic neuron, postsynaptic cell and neurotransmitters.
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