In addition to growth in dendrites, the axons of neurons become coated with ___________, a fatty substance that, like the insulation on an electric wire, provides protection and speeds the transmission of nerve impulses

While Type A behavior appears to promote heart disease, which of the following may be what triggers a heart attack?

a. overworking b. being achievement-oriented c. depression or distress d. a sense of time urgency.

Animal studies indicate that the effect of serotonin on aggression may reflect a more general effect of serotonin on

A) cognitive function. B) risky behaviors. C) threat behavior. D) maternal behavior. E) learning and memory.