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What do Ruffini's corpuscles detect?

  1. Long term pressure and heat

  2. Cold temperatures

  3. Vibrations

  4. Light touch

The correct answer is: Long term pressure and heat

Ruffini's corpuscles are sensory receptors located in the skin and are responsible for detecting long term pressure and heat. This means that they respond to prolonged pressure and sustained heat, not just brief touches or changes in temperature, unlike the other options. Ruffini's corpuscles are also not involved in detecting vibrations or light touch, making options C and D incorrect. Option B, cold temperatures, is also incorrect as Ruffini's corpuscles are not associated with detecting cold sensations.