ocr: Jumping Quit Catapults This model of a locust leg has the tendon spring. When the extensor and flexor muscles both contract, holding the knee bent, the extensor muscle stretchesits tendon. Then the flexor muscle relaxes very rapidly. This allows the stretched tendon to recoil, rapidly straightening theleg. - This model of a locust leg has the skeleton spring. The extensor and flexor muscles both contract holding the knee bent and com - pressing the spring. When the flexor muscle relaxes rapidly the spring recoils and straightens the leg.
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