Tag Archives: Bones

Fight or Flight May Be in Our Bones

by Diana Kwon, Scientific American

A protein released from bone is involved in triggering the body’s reaction to stress.

In the face of fear, whether it be caused by a grizzly bear or an audience waiting to hear you speak, your body initiates a reaction to stress. The breath quickens, the pupils dilate, the heart begins to pound. These automatic responses occur as a part of the so-called fight-or-flight response, the body’s evolved mechanism to threats around us. Scientists have known for decades that this reaction is triggered by hormones released by the adrenal glands, two cone-shaped organs that sit atop the kidneys. Now a new hormone has entered the picture—osteocalcin, a protein produced and secreted by bone.

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