This time, each magnet is now attracted to the iron plate, and don't see the other magnet on the other side of the plate, even though both of the North poles are facing each other! The diagram on the right shows what happens if you insert a superconductor between the magnets. Now, each magnet is repelled by the superconductor, and there is little or no attraction between the magnets themselves (one little field line did sneak around the superconducting plate, though).
Cardiac muscle (heart muscle) This type of muscle is found solely in the walls of the heart. It has similarities with skeletal muscles in that it is striated and with smooth muscles in that its contractions are not under conscious control. However this type of muscle is highly specialised.
There are three types of muscle tissue (more than 600 muscles) in the body including skeletal muscle, cardiac muscle and smooth muscle. Skeletal muscle is the kind of muscle that helps to create movement in the body. The skeletal muscles make up 40 percent of a person's body weight. Cardiac muscle is involuntary muscle in the body and make up the muscles found in the heart cavity. Smooth muscle is also an involuntary muscle, but it makes up the walls of organs, blood vessels and respiratory passageways.