I'm curious how your intestines feel tight. Is it the abdominal wall muscles that you're feeling, or the intestines themselves?The muscles of the intestines and GI tract are formed from different cells, and are under different nervous system control (autonomic), than your other muscles. Parts of your guts are controlled by the enteric nervous system, while your heart, lungs and some other gastrointestinal reflexes are controlled by the sympathetic nervous system, and your parasympathetic nervous system runs things when you're at rest. That's just the basics, though, it's obviously far more complex than that.I'd expect muscle tension would be a different thing in the digestive tract than in, say, your arms, back and neck, because of the different structure and nervous system control.
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