Answer:
I would be the extension of the trunk
Explanation:
The erector spinae muscle extends the vertebreal column. [1] It is formed of 3 muscles and its fibers run more or less vertically throughout the lumbar, thoracic and cervical regions. It lies in the groove to the side of the vertebral column. In cervical region it is covered by nuchal ligament and in thoracic and lumber region by thoracolumbar fascia.
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-hope I helped-
Im pretty sure this is how it works:
you burn yourself,
immediately, you jump back because obviously, it hurts
That part (the jump back) is your skeletal and muscular working together to move you away from the danger
This is called the fight or flight response.
This time, you took flight from the danger. hop this helped a bit, if not, i can edit and add more for ya :)