Advantages of volunteer work are strongest when volunteering occurs in moderation—on average, ______ hours per week

When a(n) _____ arrives at the axon terminal, it causes the release of neurotransmitters

a) precursor b) receptor c) action potential d) node of Ranvier

Between now and the year 2020, the number of older adults with substance abuse disorder is expected to

A) decline slightly. B) remain constant. C) increase somewhat. D) increase greatly.