Introduction to Cardiac Muscle. The cardiac muscle mass fast essay writing is an involuntary muscle that’s while in the striated muscle tissues category as well as skeletal muscle groups. The muscle is found largely situated in the myocardium (center layer) of your coronary heart. The cells/fibres that type cardiac muscle are generally known as the cardiomyocytes. The contraction of those cells is coordinated and it serves to propel blood out of the ventricles into systemic circulation and out of atria to the ventricles. Cardiac muscle fibres depend upon oxygen and electrical stimuli from the sino-atrial node (SAN)/pacemaker to function fast essay writing.