The sympathetic and parasympathetic nervous systems are both part of which division of the nervous system? the central nervous system
the peripheral nervous system
the somatic nervous system
the autonomic 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