Final answer:
Pressure, pain, and temperature receptors are known as exteroceptors, which detect environmental stimuli such as temperature and pain through somatosensory receptors in the skin.
Step-by-step explanation:
Pressure, pain, and temperature receptors are classified as exteroceptors. These receptors are responsive to stimuli in the external environment. For instance, somatosensory receptors located in the skin, like free nerve endings, are sensitive to thermal changes and painful stimuli. Furthermore, pain (detected by nociceptors), like that from tissue damage, and temperature (detected by thermoreceptors), which respond to changes above or below body temperature, are specific modalities handled by exteroceptors. These sensors allow us to interact with our surroundings by providing the sensation of touch, pain, and temperature changes.