In ___________, which emerges at about two years of age, children organize their play around a distinct theme and take on special roles based on the theme.

Which of the following statements about illness during middle childhood in developed countries is true?

a. Children are less susceptible to fatal diseases than they were earlier in their development. b. Middle childhood is the least safe time of life because of an increased need for independence. c. Rates of minor illnesses have increased during recent decades, even though rates of more serious illnesses have declined. d. Lead poisoning continues to be one of the top causes of death.

Muscle contractions often need to happen quickly so they are controlled via _____________ receptors

a. ionotropic b. metabotropic c. serotonergic d. dopaminergic