Interneurons, the neurons completely within the central nervous system, are organized into neuronal pools. These are groups of neurons that make synaptic connections with each other and work together to perform a common function, even though their cell bodies are often in different parts of the central nervous system. Each pool receives input from neurons (which may be part of other pools), and each pool generates output. Neuronal pools may have excitatory or inhibitory effects on other pools or on peripheral effectors.
As a result of incoming impulses and neurotrans-mitter release, a particular neuron of a neuronal pool is likely to receive a combination of excitation by some presynaptic neurons and inhibition by others. If the net effect is excitatory, threshold may be reached, and an
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This ebook provides an introductory explanation of the workings of the human body, with an effort to draw connections between the body systems and explain their interdependencies. A framework for the book is homeostasis and how the body maintains balance within each system. This is intended as a first introduction to physiology for a college-level course.