In the context of neurons, which of the following is a function of the myelin sheath?
A) It facilitates the entry of electrically charged atoms in the fluids that encase the nervous system into the neurons.
B) It prevents electrical messages from traveling down an axon.
C) It facilitates the creation of neurotransmitters.
D) It minimizes leakage of the electric current being carried along an axon.
D
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A researcher who is examining the effects of temperature and humidity on the eating behavior of rats uses a factorial experiment comparing three different temperatures (70?, 80?, and 90?) and two humidity conditions (low and high). How many factors are in the experiment?
a. one b. two c. three d. six
Mental categories used to group together objects, relations, events, abstractions or qualities that have common properties are called __________
Fill in the blank(s) with correct word
Which of the following most likely causes astronauts to become nauseated in space?
A. Their vestibular system cannot tell which way is down. B. Their bodies' kinesthetic perception is thrown off by the lack of gravity. C. Their visual system has trouble adjusting to seeing things floating and flying. D. Their brains are being bombarded by cosmic rays.
Major depressive disorder is a mood disorder that is characterized by __________
a) overwhelming sadness, despair and hopelessness. b) inappropriate affect and disorganized behavior. c) dramatic swings in mood ranging from ecstasy to despair. d) depression that comes and goes with the seasons.