Which of the following statements best describes free radicals?
A. Thick bundles of nerve cell fibers that connect the two cerebral hemispheres.
B. Specialized cell that supports, protects, or nourishes nerve cells.
C. By-products of oxygen metabolism.
D. The tiny gap between nerve cells across which neurotransmitters pass.
Answer: C
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The gating action proposed in the gate-control theory of pain apparently relies on:
a. small fibers that inhibit nervous system activity and close the pain gates b. large fibers that inhibit nervous system activity and open the pain gates c. large fibers that produce nervous system activity and close the pain gates d. the release of serotonin that inhibits nervous system activity and closes the pain gates
Basing attitudes on a few unusually good or bad experiences with a person, group, object, or institution is known as
a. the mean worldview. b. symbolic prejudice. c. chance conditioning. d. discrimination.
The ability to perceive whether your body is falling or changing speed is due to your
a. virtual reality. c. extrasensory perception. b. vestibular sense. d. sensory positioning.
All of the following substances are classified as opiates EXCEPT
A. cocaine. B. codeine. C. heroin. D. morphine.