TED-Ed: Why do we itch? - Emma Bryce

The video explores the phenomenon of itching, discussing its causes, such as bug bites and allergic reactions, and the role of histamine in the body's response. It delves into the mechanics of itching, highlighting the nerve pathways involved and the evolutionary purpose of itching as a protective mechanism. The video also addresses anomalies like delusory parasitosis and phantom itching, and discusses treatments for these conditions, including mirror therapy for amputees. Researchers are investigating genetic factors and developing treatments to block itch pathways.

What compound does a mosquito release that causes an allergic reaction leading to itching?

• Natriuretic polypeptide B

• Anticoagulant

• Serotonin

• Histamine

How do researchers believe itch signals are transmitted in the body?

• Via a subclass of nerves associated with pain

• Through blood vessels

• Through the lymphatic system

• By skin cells

What is the primary reason scratching provides relief from itching?

• It increases blood flow

• It releases endorphins

• It creates a low-level pain signal that overrides the itch

• It cools the skin

What is delusory parasitosis?

• A genetic disorder causing excessive itching

• A skin condition caused by dryness

• A type of allergic reaction to pollen

• A condition where people feel imaginary insects on their skin

How do doctors treat phantom itching in amputees?

• Through physical therapy

• With antihistamines

• By using mirrors to create an illusion

• With acupuncture