Why do we sneeze?

Answer: To expel irritants from nose

To expel irritants from nose ✓ — Correct! Sneezing is a powerful reflex that protects your respiratory system. When dust, pollen, or germs irritate your nose, nerve endings send signals to your brain. Your brain triggers a forceful expulsion of air at up to 100 mph to blast out irritants. This automatic defense keeps harmful particles from entering your lungs.

To cool down the brain — Wrong. Sneezing doesn't cool the brain. It's a reflex action controlled by the trigeminal nerve to clear irritants from nasal passages and protect the respiratory system.

To exercise facial muscles — Wrong. While facial muscles do contract during sneezing, this isn't the purpose. Sneezing is a protective reflex to expel irritants and pathogens from the nasal cavity.