The muscular system, the respiratory system, and the cardiovascular system intertwine in many ways. The muscular system, containing skeletal, smooth, and cardiac muscle, is involved in the cardiovascular system, in the form of the heart, made up of cardiac muscle tissue. The respiratory system is made up of blood vessels, made up of smooth muscle tissue that connects the heart and the lungs. The cardiovascular system supplies oxygenated blood to the muscles, preventing them from deteriorating.