12.2 True/False Questions
1) All of the neuron's organelles are localized to the cell body.
2) A neuron is a collection of nerve fibers in the PNS.
3) Special somatic senses have receptors that are located mostly in the head, including hearing and balance and vision.
4) General visceral sensory impulses include pain, temperature, nausea, and hunger.
5) Most neurons in the body are multipolar neurons.
6) The somatic motor subdivision of the peripheral nervous system is considered to be an involuntary nervous system.
7) The supporting cells of the nervous system that surround and wrap neurons are derived from embryonic neuroepithelial cells from the ectoderm.
8) The white matter is the site where neuron cell bodies are clustered.
9) Any long axon is called a nerve fiber.
10) Chromatophilic bodies are clusters of rough ER and free ribosomes that produce the large amount of proteins needed by a neuron.
11) Gliomas are tumors of glial cells. This type of cancer is difficult to treat, and the one-year survival rate is poor.
12) Microglia are ciliated to help circulate cerebrospinal fluid (CSF).
13) Oligodendrocytes and Schwann cells myelinate neurons within the peripheral nervous system.
14) Less than 15% of all neurons are interneurons.
15) Microglia are derived from blood stem cells rather than from neural tube and crest cells.