No matter what prisoners try to do, they cannot escape. Eventually, they become passive and depressed. This illustrates the central idea in the ________ theory of depression

The members of Jun's social convoy who are typically most supportive are her ______

Fill in the blank with correct word

Which of the following mechanisms adjust the sensitivity of postsynaptic receptors to dopamine, norepinephrine or serotonin?

a) second messengers b) antagonists c) neurotransmitters d) nerve impulses