Three Kinds of Muscle · Muscles
The quiet one — lining your tubes and running your insides.
Right now, without any input from you, muscle is squeezing food through your gut, adjusting the width of your blood vessels, and tightening the airways you met in the Lungs module. That's smooth muscle, and you will never feel it working.
It has no stripes — hence 'smooth' — and it contracts slowly, but it can hold a contraction for a very long time without tiring. That's exactly the right personality for a tube that needs to stay narrowed for hours.
Body Atlas is an educational product. It does not provide diagnosis, treatment, or personal medical advice. · Privacy