Final answer:
Neuronal pools are collections of (b) interneurons, which are multipolar neurons that connect sensory neurons to motor neurons within the central nervous system.
Step-by-step explanation:
Neuronal pools are collections of interneurons. Interneurons, also known as connector neurons or association neurons, are a type of neuron that connect sensory neurons to motor neurons. Unlike motor neurons, which convey impulses from the central nervous system to muscles or glands, interneurons play a crucial role in the communication between neurons within the central nervous system. Multipolar neurons, another category which includes motor neurons and interneurons, have several dendrites and one axon extending from their cell bodies. In contrast, bipolar neurons are spindle-shaped with a dendrite on one end and an axon on the other, commonly found in the retina of the eye.
A bundle of axons in the peripheral nervous system is called a nerve, and the neurotransmitter released at the neuromuscular junction is typically acetylcholine, which is not listed in the provided options. The flow of electrical signals in neurons is an essential aspect of their function, with signals typically received by dendrites, passed through the cell body, and then propagated along the axon to reach another neuron, muscle tissue, or gland.