Mark has been attending a religious study with friends from his dorm. He really likes these people, although he thinks that their interpretation of the sacred text is dead wrong. Yet in the meetings, he tends to agree with them to avoid conflict because he enjoys their friendship so much. Mark is most likely experiencing ____

Which of the following is NOT true of all neurotransmitters?

a. They are chemicals. b. They are stored in synaptic vesicles. c. They are released across the synaptic space. d. They increase the likelihood that the next neuron will fire.

Taking PCP (commonly known as "angel dust") can cause effects that mimic the symptoms of schizophrenia. Researchers believe that this is because both schizophrenia and PCP act on the neurotransmitter __________

a. GABA b. cytocin c. dopamine d. glutamate