A researcher plans to conduct an experiment to test whether a cup of hot milk at night helps people fall asleep faster than usual. In this study, the independent variable is ________
a. the amount of time it takes participants to fall asleep.
b. the consumption of hot milk at bedtime.
c. the number of participants drinking hot milk at bedtime.
d. the number of hours each participant sleeps for.
Answer: b
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A potential cause of muscle deterioration in the elderly population is a(an)
A. increase in size of muscle fibers B. increase in number of muscle fibers C. increase in androgen production D. decrease in size and number of muscle fibers E. decrease in androgen production
The reason that the inside of the axon is more negatively charged than the outside of the
axon is because the a. transmitter substances in the terminal button are negatively charged. b. myelin sheath that surrounds the axon contains negative proteins. c. ion transporters are negatively charged. d. axon contains more negatively charged ions and fewer positively charged ions. e. cell body transmits negatively charged ions to the axon.