The following line structure represents a molecule of propyne. 
Definitions:
All-or-None Law
A principle stating that the strength of a response of a nerve or muscle fiber is not dependent on the strength of the stimulus. If a stimulus is above a certain threshold, a nerve or muscle fiber will fire.
Impulse
A sudden strong and unreflective urge or desire to act.
Necrotic
Pertaining to the death of cells or tissues in the body, often as a result of disease, injury, or lack of blood supply.
Autonomic Nervous System
A part of the nervous system that controls involuntary actions of the smooth muscles and heart and also regulates glandular functions.
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