Q: What exactly are urban legends? A: Urban legends are popular stories alleged to be true and passed from individual to individual via oral or written (e.g. forwarded email) communication.: What exactly are urban legends? A: Urban legends are popular stories alleged to be true and passed from individual to individual via oral or written (e.g. forwarded email) communication.
When a person gets injured, their brains release chemicals called opioids into the space between neurons that acts to dull the pain signals. The effect is seen the most in the brain regions called the ventral striatum, amygdala, midline thalamus, and periaqueductal gray.
Histamine Release Symptoms. Histamine is a chemical in the body that is released when the body is exposed to an allergen. Allergens may include airborne allergens (such as pollen and dust mites), certain foods (such as peanuts and shellfish) or insect venom. Histamine is released in an effort to protect the body from an allergen; however, sometimes an overload of histamine can result in life-threatening symptoms.