In nervous system physiology, the definition of a reflex is a ________
A) rapid, predictable, involuntary motor response to a stimulus
B) variable response to a startling stimulus
C) well thought out, therefore slow, response to an emergency situation
D) voluntary response, which can be withheld
Answer: A
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Match the term with its description (answers may be used more than once).
1. highly branched cells that transfer nutrients between blood vessels and neurons 2. specialized immune cells that are confined to the CNS 3. cells that form supportive capsules around cell bodies .4 cells that create a selectively permeable epithelial layer to separate fluid compartments of the CNS 5. cells in the CNS that form myelin 6. cells in the PNS that form myelin 7. cells that are a source of neural stem cells 8. cells that myelinate several axons 9. cells that myelinate only one axon each; multiple cells per axon A. ependymal cells B. astrocytes C. satellite cells D. Schwann cells E. oligodendrocytes F. microglia
How alike are our genomes?
A) About 25% B) Nearly 100% C) About 75% D) About 10%
true or false? A stop codon codes for an amino acid as well as the signal to stop.
a. true b. false
Type 2 diabetes mellitus results from
A. a deficiency of insulin. B. a deficiency of insulin and insensitivity of cells to insulin. C. an infection. D. insensitivity of cells to insulin.