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Transcript
The Synaptic Cleft or Synapse A neuron’s axon ends in many small swellings called axon terminals. At the axon terminal the neuron may meet dendrites of another axon or an effector, like a muscle or gland. The space where neurons meet other neurons or effectors is called the synapse. There are presynaptic neurons and postsynaptic neurons. The axon terminal at a synapse contains tiny vesicles filled with chemicals called neurotransmitters. If a nerve impulse takes place, vesicles fuse and release the neurotransmitter. A common neurotransmitter is acetylcholine. Example Nerve impulse moves to axon terminal Acetylcholine released from vesicles into synapse Acetylcholine opens Na+ pumps in new neuron and depolarization takes place. Cholinesterase is released to destroy acetylcholine (implemented without cholinesterase the neuron would stay depolarized) Lack of acetylcholine allows repolarization to take place.
