The part of the brain which acts as a switchboard or relay station, sending incoming messages to the appropriate areas of the brain, is the ______

Despite its dangers, a young man continues to take cocaine because of the feeling of euphoria it produces for him. This powerful arousal of his nervous system is probably due to cocaine's ability to

A) inhibit enzymes that break down neurotransmitters. B) increase the release of neurotransmitters. C) block the receptor sites for neurotransmitters. D) prevent neurotransmitters from being reabsorbed into presynaptic terminals.

Glial cells contribute to the development and maintenance of neuronal connections; neurons form ___ times as many connections in the presence of glial cells

A) 2 B) 7 C) 30 D) 100