Morphine and other opiate drugs decrease sensitivity to pain by ____.
A. depleting substance P from parts of the nervous system
B. mimicking the effects of endorphins at the synapses
C. preventing sodium from crossing the membrane
D. altering blood flow to various parts of the nervous system
Answer: B
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The complexity or quality of sound that makes instruments, voices, and other sources of sound unique is called
A) audition. B) acuity. C) timbre. D) wavelength.
The year is 1865, and Jan is a member of a popular volunteer youth organization. The organization stresses the importance of service to others, belief in God, and developing
self-control. Sometimes during meetings, the group engages in competitive sports, and occasionally has rowdy celebrations under the leadership of their 19-year-old president. Jan is most likelya. female. b. male. c. from a rural area. d. from a wealthy family