the need for coordination

• heart muscle is unusual in that it can initiate it's own contraction- because of this property, heart muscle is described as myogenic.
• The heart muscle will contract and relax rhythmically even if it isn't connected to the body.
• The muscles from the atria and the muscles from the ventricles each have their own natural frequency of contraction. The atrial muscle tends to contract at a higher frequency than the ventricular muscle does.
• What is fibrillation?

  Irregular and rapid contraction of the heart muscles, resulting from the fact that the contraction of the heart chambers is not synchronized.