What is a muscle that contracts regularly every day of life?

The heart is a muscle that contracts regularly every day of life. It is responsible for pumping oxygenated blood throughout the body and removing deoxygenated blood. The heart muscle is made up of specialized cardiac muscle cells that are capable of contracting and relaxing in a coordinated manner. This contraction and relaxation is controlled by electrical signals that are generated by the heart's electrical system. The heart rate is controlled by the autonomic nervous system, which can increase or decrease the heart rate in response to the body's needs.