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Because they are controlled by the autonomic nervous system which is responsible for involuntary control of the heart and digestion (as well as breathing and such). If you had to voluntarily control your digestion or heart rhythm you wouldn't survive very long.

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Q: Why are the muscles of the heart and stomach are involuntary muscles?
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Related questions

What are muscles you do not control called?

involuntary muscles. Stomach, intestines and your heart are examples.


What are the names of some involuntary muscles?

heart, stomach, intestines


Are your heart muscles voluntary or involuntary?

Heart muscles are involuntary.


Involuntary muscles are also called?

The muscles of the digestive system are smooth muscles.


Muscles that you cannot cantrol?

You cannot control the muscles in your heart and brain, and also your lungs, because they work automatically.


Are stomach muscles voluntary or involuntary muscles?

It is most definitely involuntary. You do not have to make your stomach contract every time you eat something.


Are skeletal muscles voluntary or involuntary?

skeletal muscles are voluntary muscles.


What is a example of involuntary muscles?

One example of involuntary muscles would be in the digestive system, where muscles in the stomach churn food.


What organ has involuntary and striated muscles?

The heart as both involuntary and striated muscles. The striations are similar skeletal muscles. Heart muscles are involuntary like the muscles seen in the digestive tract, called smooth muscle.


What other involuntary muscles exist besides the heart?

If by involuntary you mean acting of its own accord, the organ the lungs act without you controlling them, even when you hold your breath eventually you will breathe of your own accord. The stomach and intestines are involuntary muscles.


What are examples of involuntary muscle movement?

heart, so cardiac muscle. Smooth muscle is also involuntary in the intestines.


What are muscles such as the heart that automatically do there jobs?

involuntary muscles