TED-Ed: Why do people have seasonal allergies? - Eleanor Nelsen

The video explains seasonal allergies, their symptoms, and the immune system's role in causing them. It discusses how genetics and environment influence allergy development, including theories like the hygiene hypothesis. Common allergens and severe reactions like anaphylaxis are covered, along with treatment options such as medications, immunotherapy, and unconventional methods like hookworms.

What is the primary cause of seasonal allergies?

• An increase in humidity levels

• A virus that spreads during spring

• A hypersensitive immune response to harmless substances

• A deficiency in vitamin D

How does the immune system react to allergens like pollen?

• By producing more red blood cells

• By increasing body temperature

• By releasing antibodies and inflammatory chemicals

• By reducing blood pressure

Why do some people develop allergies while others do not?

• It depends solely on diet

• It is influenced by genetics and environment

• It is determined by the amount of exercise

• It is based on the amount of sunlight exposure

What is the hygiene hypothesis?

• A theory that suggests allergies are caused by poor hygiene

• A theory that suggests a lack of exposure to microbes leads to allergies

• A theory that suggests allergies are due to excessive cleanliness

• A theory that suggests allergies are caused by pollution

Which of the following is NOT a common allergen?

• Water

• Insect venom

• Animal dander

• Pollen

What is the role of antihistamines in allergy treatment?

• They prevent histamines from binding to cells

• They increase blood pressure

• They increase the production of antibodies

• They stimulate the immune system

How might hookworms help in treating allergies?

• By increasing the production of histamines

• By secreting chemicals that blunt the immune system

• By enhancing the body's inflammatory response

• By reducing the number of white blood cells