Charged particles that play an important role in the firing of action potentials in the nervous system are called ____
a. ?hormones
b. ?transmitters
c. ?ions
d. ?precursors
ANSWER:
c
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The function of a myelin sheath is to ____
a. prevent action potentials from traveling in the wrong direction b. increase the velocity of transmission along an axon c. increase the magnitude of an action potential d. provide a store of nutrients for the neuron
The clear-cut-attachment phase occurs at about 6 or 7 months and is characterized by intensified dependence on the primary caregiver, usually the mother
Indicate whether the statement is true or false
Which of the following is an example of a gene-environment interaction?
A. People with the recessive allele for gene X are shorter on average than those with the dominant allele. B. People with either allele for gene X are shorter when they are malnourished as children than when they are not. C. People with the recessive allele for Gene X are shorter than those with the dominant allele, and shortest when they were also malnourished as children. D. People with the dominant allele for Gene X are taller than those with the recessive allele, regardless of whether they were malnourished as children.
From ages 3 to 6, the typical American child grows ____ inches per year and adds ____ pounds
a. 1–3; 1–5 b. 2–3; 5–7 c. 6–9; 7–10 d. 9–12; 9–12