Examlex
Which of the following items is a nonexpendable item?
Myelin
An insulating fatty layer that surrounds the nerve fibers, enhancing the speed of electrical impulses in the nervous system.
Impulses
Electrical signals that travel along the neurons, triggering responses such as muscle contractions or gland secretions.
Neuron
A specialized cell transmitting nerve impulses; a nerve cell.
Smooth Muscle Fibers
Muscle tissue that is involuntary, non-striated, and found in the walls of internal organs and blood vessels.
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