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15. White matter is composed of A. ganglial sheaths. B. bundles of myelinated axons. C. collections of nerve cell bodies. D. bundles containing both myelinated axons and nerve cell bodies. E. collections of unmyelinated axons. 16. Depolarization of the nerve cell membrane occurs when there is a rapid influx (inflow) of A. potassium ions. B. chloride ions. C. calcium ions. D. sodium ions. E proteins. 17. During the absolute refractory period, the cell A. gencrates many local potentials. B. is insensitive to further stimulation. C. responds to even weak stimuli. D. reverses the direction of the action potential. E. is very sensitive. 18. There areenlargements of the spinal cord where nerves supplying the extremities enter and leave. A. two B. three C. four D. five E. six
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