A surgeon removes a section of a body organ. Once removed, the muscle tissue continues to contract, even in the absence of nervous stimulation. The removed section likely came from the heart, arm, spine, or esophagus ?
arm
the only other answer would be your whole head haha :p
IM IN LOVE WITH THE COCO
I believe it to be heart. The muscles of the heart stimulate their own contraction.
Well, the contracting would happen to nearly any part of the body with muscle. This is because many things besides the brain can send a signal through the nerves or otherwise cause cells to have responses. Now, the question is likely wanting a person to know that the heart has a cluster of nerve tissue on it that allows it to keep beating regardless of brain activity. This is a heart's own pacemaker. Side note, back to the first thing I said, one of the easiest ways to illustrate how more than one specific thing can trigger parts of our body, is pressure on eyes. Don't do this, but if there is enough pressure on our eyes the nerves that detect light can be triggered due to the pressure and not light.
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