What percentage of individuals experience significant brain loss with age?

If Melissa is like most women in the National Opinion Research Center survey of sexual practices, which activity is she most likely to rate as very appealing?

a) vaginal intercourse b) masturbation c) active oral sex d) receptive oral sex

Malcolm is studying alone in his room when he hears a loud noise downstairs. His heart rate and respiration speed up

He wonders if a burglar has entered the house. When he looks downstairs, he sees that his cat just knocked over a plant. He begins to relax and his heart rate and breathing slow down. Which part of his nervous system is working to return him to a normal state? a) spinal cord b) somatic nervous system c) parasympathetic nervous system d) central nervous system