Which automatic system conserves energy by returning the body to a normal activity level through a lowered heart rate and blood pressure?
a. peripheral nervous system
b. sympathetic nervous system
c. somatic nervous system
d. parasympathetic nervous system

The answer to this will be from your lab notes/procedure. it would be best to ask another student who participated in the lab as we do not know what was done, what enzyme or if the temperature is celsius or fahrenheit. if i were to guess though i'd say the rate stopped due to enzyme denturing at high temperature

Dis the correct answer thats what i put and it was right 

Breacking the law and lazy