are secreted by one cell into the tissue fluid, diffuse to reach nearby cells in the same tissue, and stimulate their physiology.

what statement best describes the difference between the sympathetic and parasympathetic nervous systems?

the sympathetic nervous system prepares the body for intense physical activity and is often referred to as the fight-or-flight response. the parasympathetic nervous system has almost the exact opposite effect and relaxes the body and inhibits or slows many high energy functions.

you know they are heterozygous for a trait because they have it as jj or jj.