MICROANATOMY

Detailed explanation-1: -The arrival of a nerve impulse at the presynaptic terminals causes the movement toward the presynaptic membrane of membrane-bound sacs, or synaptic vesicles, which fuse with the membrane and release a chemical substance called a neurotransmitter.

Detailed explanation-2: -Acetylcholine in the Peripheral Nervous System With the stimulation of the presynaptic terminal, acetylcholine is released from the vesicles and into the synaptic cleft, where the neurotransmitter is free to bind with receptors.

Detailed explanation-3: -Nerve impulse release The axonal terminals are specialized to release the neurotransmitters of the presynaptic cell. The terminals release transmitter substances into a gap called the synaptic cleft between the terminals and the dendrites of the next neuron.

Detailed explanation-4: -An action potential travels the length of the axon and causes release of neurotransmitter into the synapse. The action potential and consequent transmitter release allow the neuron to communicate with other neurons.