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Some of the muscles that you cannot consciously control include your heart, your stomach, and your lower digestive organs. You are probably aware that you don't control your heartbeat directly with your mind (an organ called the "sinus node" communicates with a part of the brain that you don't "control" to pace the heart), but let me explain to you about the second two examples. You may or may not already know this, but it's not only acids that digest food in the lower digestive system, but a function known as "mechanical digestion" occurs there too. Mechanical digestion (the counterpart of "chemical digestion") is when food is literally mashed up by part of your body, such as your jaw. When food is in your stomach, or large intestines, etc., muscles in that organ expand and contract to mechanically digest your food, and all this happens without your control.

Now some muscles, such as the diaphragm, are semi-autonomous, and sometimes work under your control, and sometimes not. Your diaphragm, for example, is sometimes controlled by the conscious mind to control breathing when playing an instrument, swimming, doing breathing exercises, etc.

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