Which of the following is NOT true of action potentials?
a. They are generated according to an all-or-none principle. b. They all travel at the same speed.
c. They are electrical charges that shoot down the axon.
d. They are initiated when the axon is depolarized sufficiently. e. They are followed by a refractory period.
b
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Breastfeeding, rather than bottle-feeding, improves infant mortality rates in:
a. both developing and developed nations b. developing nations but not in developed nations c. developed nations but not in developing nations d. neither developing nor developed nations
One reason westward travel is less disruptive of the circadian than eastward travel is that it is easier to ___ than to ___
a. go to sleep later; go to sleep when you are not sleepy b. go to sleep early; go to sleep later c. sleep during the day; stay awake when it's dark d. go to sleep early; go to sleep when you are used to