Existing, underlying factors that play a role in making an individual particularly susceptible to developing the symptoms of a mental illness are called precipitating causes

In a reflex arc, the coordination between contraction of certain muscles and relaxation of others is mediated by ____

a. glial cells b. motor neurons c. sensory neurons d. interneurons

Human sperm formation requires approximately ____

a. 32 days c. 72 days b. 52 days d. 82 days