What type of muscle is the muscle of the heart?

Muscle is a specialised tissue of mesodermal origin. About 40-50% of the body weight of a human adult is contributed by muscles.Muscles have special properties like excitability, contractility, extensibility and elasticity..Skeletal muscles are known as voluntary muscles because their activities are under the voluntary control of the nervous system. Cardiac muscles are the muscles of the heart. They are striated in appearance and involuntary in nature.