GENERAL HISTOLOGY

Detailed explanation-1: -Answer and Explanation: Synaptic knobs are located on a neuron’s axon. The axon can be very long and have many synaptic knobs. They are bulbous terminal end points that communicate with other cells via chemical messengers–neurotransmitters.

Detailed explanation-2: -When a nerve impulse arrives at the synaptic knob, then the neurotransmitters are released into the synaptic cleft. The plasma membrane of the postsynaptic neuron contains the receptors for the neurotransmitter. The neurotransmitter results in various actions like contraction of a muscle or activation of other neurons.