Why do our eyes water when we yawn?
Show answer & explanation
Answer: Facial muscles squeeze tear glands
Facial muscles squeeze tear glands ✓ — Correct! When you yawn, facial muscles contract strongly, putting pressure on the lacrimal glands (tear glands) near your eyes. This squeezing forces tears out, making your eyes water. It's a mechanical effect, not emotional.
Body expels excess moisture — Wrong. Watery eyes during yawning isn't about expelling moisture. It's caused by pressure on tear glands from contracting facial muscles.
Oxygen rush stimulates tear ducts — Wrong. Oxygen intake doesn't stimulate tear production. The tears come from facial muscles squeezing tear glands during the yawn.
More Human Biology questions
- Why does calorie restriction affect different aging pathways than chronic disease in mice?
- Why do different tissues in the body age at different rates?
- After a long flight, why is a brief daytime nap safer than sleeping for hours?
- Why can late-afternoon coffee at your destination sabotage first-night jet lag?
- Why can jet lag upset your stomach even after a decent sleep on the plane?
- For a 36-hour overseas trip, why might staying on home sleep hours beat forcing local time?