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Which corpuscle in the skin is sensitive to heat?
Meissner
Reticular
Pacinian
Ruffini
The correct answer is: Ruffini
The correct answer is Ruffini corpuscles. These specialized receptors are located in the deeper layers of the skin and in joint capsules. Ruffini corpuscles are sensitive to sustained pressure and stretch, which includes the detection of temperature changes, particularly heat. They play a crucial role in providing the brain with information about the state of the skin and underlying tissues, and they contribute to the sensation of warmth when the temperature of the skin becomes elevated. Meissner corpuscles are primarily sensitive to light touch and changes in texture rather than heat. Reticular corpuscles are not typically classified in standard sensory receptor categories associated with temperature; rather, they might refer to other structures more involved in proprioception or deeper pressure. Pacinian corpuscles, also known as lamellar corpuscles, are highly sensitive mechanoreceptors primarily responsive to deep pressure and vibration, rather than thermal changes like heat. Understanding the specific functions of these various corpuscles helps clarify why Ruffini corpuscles are the appropriate choice for heat sensitivity in the skin.