Bradykinin is also known as kallidin I and callideic I. It is a a hormone with the chemical formula of C50H73N15O11.

It causes muscle contractions in the lungs, uterus, and intestines. This hormone also forms in blood plasma and can dilate blood vessels (resulting in lowered blood pressure) and make one more sensitive to pain. It also plays a role in inflammation.

This writeup is based on work I did for the science dictionary at

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