Which of the following statements is true?
a. Signals above the threshold of excitation will prevent a neuron from firing.
b. The strength (intensity) of a neuron's action potential depends on the strength of
its excitation.
c. A neuron fires in response to every message it receives.
d. Impulses in myelinated neurons may reach speeds of nearly 400 feet per second.
d
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In twin studies it was found that if one member of a pair of identical twins abused alcohol the other abused it in ___% of cases. In a similar study of fraternal twins, if one twin abused alcohol the other abused it in ___% of cases.
a.) 54;28 b.) 27;9 c.) 95;65 d.) 70;16
Although the average male and female IQ is about the same, ______ men have mental retardation and ______ men have superior IQ scores
a. fewer; fewer c. more; fewer b. fewer; more d. more; more