Upon vigorous exercise, your heart rate increases to 200 beats per minute to supply sufficient oxygen to muscles. which is responsible for this regulation of the heart rate? a. semilunar valves
b. sinoatrial node
c. aorta

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.