what happens at the synapse between two neurons
- Membranes of neurons are separated by fluid-filled spaces called synaptic cleft.
- Axon terminals have vesicles filled with chemicals (neurotransmitters).
- Impulse stimulates the movement of synaptic vesicles towards the membrane.
- Here, they fuse with the plasma membrane, and release their neurotransmitters at the synaptic cleft where they bind with their specific receptors.
The neurons lie end to end in chains to transmit impulses through the body. Each neuron receives an impulse through its dendrites and passes it on to the next neuron in the chain through its axon. For cell to cell relay of impulse the terminal of the axon of each neuron come very close to the dendrites of the adjacent neuron leaving only a microscopic gap. This end to end position of the axon of one neuron and the dendrites of another neuron without actual contact is called the Synapse. At the end of the axon, the impulse sets off the release of some chemicals. These chemicals cross the synapse and start a similar impulse in a dendrite of the next neuron..,,,,..
hope this helps........
The incoming neuron releases its transmitter (following depolarization of the nerve terminal and calcium influx), and that transmitter diffuses across the synapse to interact with receptors on the soma and dendrites of the next neuron. This either excites or inhibits the target neuron, depending on the nature of the chemical transmitter.