関連ワード:
what type of muscle is the heart made out of what type of muscle is the heart made up of what kind of muscle is the heart made out of what type of muscle tissue is the heart made out of what kind of muscle is the heart made up of what type of muscle is your heart made out of what type of muscle tissue is the heart made up of what type of muscle is your heart made up of what kind of muscle is your heart made out of what type of muscle is the heart made of
