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