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Something called the ileocecal valve, located between the small intensive and large intestine, may be involved, according to Jef L’Ecuyer, a registered dietician.

The test had been routine until Chan got close to the spot where the colon and the small intestine connect, a structure known as the ileocecal valve.

It is possible to force open the ileocecal valve from the wrong direction, but it does not happen naturally, in the course of day-to-day living.

No less than five experimenters, representing Britain, France, Germany, and the United States, from 1878 to 1885, tested the competence of the ileocecal valve.

The ileocecal valve, the anatomical portal between the small intestine and the colon, opens in one direction only.