Nervous System I
OUTCOMES 10.3, 10.4
1. Why are rapidly growing cancers that originate in nervous
tissue more likely to be composed of neuroglia than of
OUTCOMES 10.3, 10.4, 10.6
2. In Tay-Sachs disease, an infant rapidly loses nervous system
functions as neurons in the brain become covered in too much
myelin. In multiple sclerosis, cells in the CNS have too little
myelin. Identify the type of neuroglia implicated in each of
OUTCOMES 10.4, 10.5, 10.7
3. How would you explain the following observations?
a. When motor nerve F
bers in the leg are severed, the muscles
they innervate become paralyzed; however, in time, control
over the muscles often returns.
b. When motor nerve F
bers in the spinal cord are severed, the
muscles they control become permanently paralyzed.
INTEGRATIVE ASSESSMENTS/CRITICAL THINKING
OUTCOMES 10.5, 10.6, 10.7
4. Drugs that improve early symptoms of Alzheimer disease do
so by slowing the breakdown of acetylcholine in synaptic clefts
in certain parts of the brain. ±rom this information, suggest
a neurotransmitter imbalance that lies behind Alzheimer
5. What might be deF
cient in the diet of a pregnant woman
complaining of leg muscle cramping? How would you explain
this to her?
6. People who inherit familial periodic paralysis often develop
very low blood potassium concentrations. How would you
explain that the paralysis may disappear quickly when
potassium ions are administered intravenously?
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