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The answer is isometric contraction. Isometric contractions generate force without changing the length of the muscle.
Hope this helps! :)
I personally suffer from widespread Stage IV endometriosis and mine has never appeared this way. The left side pain isn't necessarily from endometriosis on the colon, it could anywhere in there. The (cherry) angioma would usually not have anything to do with the colon, but angiomas can occur due to a hormonal imbalance (from the endometriosis.)
Each scientist made an important, but unrelated, contribution. Scientists built on the previous work of other scientists to make new discoveries. Most of the discoveries were made by chance and did not depend on prior knowledge.
