what does muscles contracting a little bit all at once do?
biceps cause death respiration staying warm rapid expansion movement heat the body to move people
A B C D E F G H
Shivering heats the body.
many muscles contracting a little bit all at once heats the body
what does muscles contracting a little bit all at once do? (A) biceps (B) cause death (C) respiration (D) staying warm (E) rapid expansion (F) movement (G) heat the body (H) to move people