Q:Answer the following question given this paragraph: Cardiac muscle is found only in the walls of the heart. When cardiac muscle contracts, the heart beats and pumps blood. Cardiac muscle contains a great many mitochondria, which produce ATP for energy. This helps the heart resist fatigue. Contractions of cardiac muscle are involuntary like those of smooth muscle. Q: What muscle is found only in the walls of the heart? Choices: - respiratory muscle - abdominal muscle - skeletal muscle - cardiac muscle A:
A:
cardiac muscle