Q: Which of the following is involved in the transmission of nerve impulses?  

Answer: D

Neurotransmitters are specialized chemical compounds that are released by the presynaptic neuron in response to an action potential. These neurotransmitters then diffuse across the synaptic cleft and bind to specific receptors on the post-synaptic neuron or effector cell, leading to a change in its membrane potential and the transmission of a nerve impulse. There are many different types of neurotransmitters, including acetylcholine, dopamine, serotonin, and norepinephrine, each of which has a unique role in modulating the activity of the nervous system. In contrast, synaptic knobs are the enlarged axon terminals that contain the vesicles of neurotransmitters, while Schwan cells are glial cells that form the myelin sheath around axons and Nissl's granules are clusters of rough endoplasmic reticulum found in the cell bodies of neurons.

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