NEET BIOLOGY

Detailed explanation-1: -The synaptic knob is a bulb-like structure that is present at the end of the axon in a neuron. It consists of mitochondria and synaptic vesicles (small granules). The synaptic vesicles contain chemicals called neurotransmitters that transmit signals to postsynaptic neurons.

Detailed explanation-2: -There are many different types of neurotransmitters, with acetylcholine being the most well-studied. It is used in peripheral neuromuscular synapses, autonomic ganglia, and some central synapses.

Detailed explanation-3: -The synaptic knob is filled with membrane-enclosed vesicles containing a neurotransmitter. Arrival of an action potential at the synaptic knob opens Ca2+ channels in the plasma membrane. The influx of Ca2+ triggers the exocytosis of some of the vesicles. Their neurotransmitter is released into the synaptic cleft.

Detailed explanation-4: -What are neurotransmitters? Neurotransmitters are chemical messengers that your body can’t function without. Their job is to carry chemical signals (“messages”) from one neuron (nerve cell) to the next target cell.

Detailed explanation-5: -A synaptic knob is a terminal branch at the end of the post synaptic neuron. The presynaptic neuron ends in swelling and is called the synaptic knob. Small vesicles contain neurotransmitters. Neurotransmitters are chemicals that the body makes to relay a message between neurons and other cells.