The human body can heal itself, but only up to a point. If an injury removes 20% or more of a muscle — as can happen in car accidents, certain surgeries or explosions in combat zones — natural processes can’t, on their own, replace it. Instead, the wound seals up, covered by scar tissue.
“The body sees this extensive loss of tissue as an insurmountable void,” says Jonathan Grasman, an assistant professor of biomedical engineering.
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