Identify the factors that determine the speed at which an action potential travels along an axon.
What will be an ideal response?
Students' answers may vary.
The particular speed at which an action potential travels along an axon is determined by the axon's size and the thickness of its myelin sheath. Axons with small diameters carry impulses at about 2 miles per hour; longer and thicker ones can average speeds of more than 225 miles per hour.
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Imagine a group of students who support the death penalty being asked the following question:
"Would you still support the death penalty even if you learned that low-income individuals have a harder time defending against it than do higher-income individuals?" Which of the following statements is the most likely result? Preadolescents would be more likely than adolescents to change their minds. Adolescents would be more likely than preadolescents to change their minds. Both preadolescents and adolescents would tend to continue supporting the death penalty. Neither preadolescents nor adolescents would tend to continue supporting the death penalty.
The aging process has been a matter of interest and a subject of research for centuries. This research has established a(n) _______
a. empirically documented single theory of aging b. diversity of current propositions about the aging process, most supported by some empirical evidence c. diversity of empirical evidence, all pointing to 4 primary theories of aging d. unified theory of aging at the cellular level