There are three different
types of muscles, skeletal, smooth and cardiac. Muscles are attached to the bones by tendons and are made of proteins. Skeletal
muscles are usually attached to the bones and responsible for voluntary movements. Smooth
muscles are not under voluntary control, have one nucleus, are spindle shaped, and are not striated. They are found in the stomach, blood vessels, and intestines. They
are the muscles that move food through the digestive tract. They also control
blood flow through the circulatory system. An interesting fact about smooth muscles is that they are the muscles that decrease
your pupil size in light. Smooth muscles are connected by gap junctions; these
gap junctions allow electrical impulse3s from one muscle cell to another. Cardiac muscle is found in the heart and it contracts
to pump blood through the circulatory system.
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