MEHAU KULYK / SCIENCE PHOTO LIBRARY MEHAU KULYK / SCIENCE PHOTO LIBRARY
Biomechanics. Historical artwork of two humans bearing loads. This illustration is taken from De Motu Animalium (On Animal Motion, 1680) by Alfonso Borelli (1608-1679). The illustration demonstrates how the leg is a twin-lever system controlled by muscles in which the hip (D) and knee (C) are both pivots.
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