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Asked by anon-178535 to Samuel, Pankaj, Lucy, Kate, Emma on 12 Jun 2018.
Question: what is cardiac muscle made of ?
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Samuel Vennin answered on 12 Jun 2018:
The heart is surrounded by a muscle that we call the myocardium. It is composed of extensible fibers that can contract (to ejected the blood out of the heart) and relax (to allow filling of the heart). An electric signal goes through the fibers and control the contraction and relaxation of those fibers.
You have at this link a nice video explaining the role of those fibers and the electrical signal (ECG) that we always see on TV when a character is at the hospital:
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Kate Kuyt answered on 12 Jun 2018:
What is really great about heart muscle – called myocardium – is that it isnt just one layer of muscle. In the main pumping chamber the left ventricle, there are three layers of myocardium, all facing slightly different angles and they work together to make sure the heart pumps really effectively.
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Emma Wellham answered on 13 Jun 2018:
The heart muscle (called myocardium) is made up of small cells called myocytes. Myocytes are special cells because they can generate electrical signals needed to make the heart beat, without the need for attached nerves. These cells can pass the electrical signal quickly from one cell to the next, so that the heart chambers contract together.
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