21. The most active toxin, resiniferatoxin, binds to pain receptors in the same way as capsaicin but much more powerfully. 22. The doctors theorized that the density of pain receptors in the ear lobe might be lower than in the thumb. 23. Braun underwent surgery in October to desensitize the pain receptors near the nerves at the base of his right thumb. 24. A . You have three different kinds of nerve fibers running from your touch and pain receptors to your brain. 25. The astringent makes your tissues contract, which puts a mechanical force on the pain receptors and makes them go'ouch '. 26. Paintal discovered several sensory receptors including atrial B receptors, pulmonary J-receptors, ventricular pressure receptors, stomach stretch receptors, and muscle pain receptors . 27. Professor Bartoshuk remembered that a colleague, Mark Whitehead, had shown that pain receptors in the mouth were wrapped around taste buds. 28. Because the shallow cut does not bleed very much, the pain receptors are left open to the air, ensuring continued pain. 29. There are no pain receptors in the colon, and you can watch the event progress on a television monitor at no extra charge. 30. A pain receptor is essentially a doorway into the nerves that allow pain signals to pass up the spinal cord to the brain.
