The myelin sheath, which is found around some types of axons,
a. has no known function.
b. is composed of glial cells.
c. decreases the speed of nerve signal conduction.
d. increases the likelihood that harmful substances will reach the brain.
Answer: b. is composed of glial cells.
You might also like to view...
Benzodiazepines are clinically preferred over barbiturates because the former
a. are better at sedating people b. are better at inducing sleep in people c. have considerably higher therapeutic indexes d. all of the above
Nadine had a stroke that was confined to the right side of her brain. Based on hemispheric lateralization studies, you might expect that Nadine would have the most problems with tasks that require
a. spatial skills, such as fitting together puzzle pieces. b. language and communication. c. fine motor coordination. d. mathematics and logical reasoning skills.