Shivering occurs when many muscles contract a little bit all at once, and involuntary contractions, shivering, cause the production of heat. Given these facts, what occurs when many muscles contract a little bit all at once among the following options:
- the production of cells
 - preventing heat transfer
 - To keep their body heat.
 - the production of heat
 - Generating heat
 - recovery time from fatigue
 - the production of cold
 - the production of skin


 

    the production of heat     