Although the brain processes every pain signal in your body, brain tissue itself has zero pain receptors.
Because the brain lacks nociceptors, neurosurgeons can perform awake brain surgery while talking to a patient. When you get a headache, it is the surrounding membranes, blood vessels, and scalp muscles hurting—not the brain.
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Quick Guess: When you experience a headache, where does the pain actually come from?
Verified Answer: Surrounding membranes, blood vessels, and muscles
Quiz Question: When you experience a headache, where does the pain actually come from?
Correct Answer: Surrounding membranes, blood vessels, and muscles
Brain tissue has no pain receptors; headaches arise from surrounding tissues and blood vessels.
Newborns start life with roughly 300 separate bones and cartilage segments, which fuse down to 206 by adulthood.
Laid end to end, the arteries, veins, and capillaries in an adult human body stretch roughly 96,000 kilometers (60,000 miles).
With a pH between 1.5 and 2.0, human stomach hydrochloric acid can chemically dissolve thin metal over hours.
The transparent cornea at the front of your eye has zero blood vessels—it absorbs oxygen straight from the air through tears.