
Concept introduction: The body’s neural information system is complexity that is built on simplicity. The building blocks of the nervous system are called neurons or nerve cells. Throughout our life, new neurons are born and unused neurons are withered away.

Answer to Problem 1TYS
Correct answer: The neuron fiber that passes messages through its branches to other neurons or to muscles and glands is the axon.
Explanation of Solution
Neurons consist of a cell body and its branching fibers. The nerve cell has a single lengthy axon fiber that passes the messages through their terminal branches to other neurons or to muscles or glands. Axons are long and they project several feet through the body. Some axons are encased in a myelin sheath, which is a layer of fatty tissue that insulates the axon, and stimulates their impulses.
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