By Your hands are mechanical marvels, with pulleys—in the form of tendons—flexing and extending to open and close your fist, and straighten and bend your fingers. Each tendon is wrapped in a sheath that holds it in place.
Your hands are mechanical marvels, with pulleys—in the form of tendons—flexing and extending to open and close your fist, and straighten and bend your fingers. Each tendon is wrapped in a sheath that holds it in place.
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