When the hoof of a galloping horse hits the ground, the digital flexor tendon in its lower leg may stretch by 5% in length, a significant stretch for this 45 cm tendon. The tendon is elastic; most--but not all--of the energy stored in the stretch is returned, which allows for efficient locomotion. In an exercising horse, the tendon may reach a temperature of 46 ºC, much higher than the horse's 38 ºC body temperature. How can you explain this temperature rise?A. The energy portion of the stretch that is not returned is converted to the heat in the tendon.B. Locomotion partially blocks the heat exchange inside the tendon leading to a temperature increase.C. The energy portion of the stretch that is not returned is converted to the locomotion, causing a temperature rise due to the friction.D. The stretch energy transformation requires additional thermal energy, which is produced in the tendon on purpose.

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