Crocodile Tears Are Real (And Could Help Cure Dry Eyes)

The video explores the myth of crocodile tears, revealing that while crocodiles don't cry from remorse, they do exhibit watery eyes during meals. A 2007 study on alligators and Cayman, close relatives of crocodiles, showed that tear film regurgitation occurs due to lung exhalation, causing frothing and bubbling. These reptiles have highly efficient tear films, which are more stable than human tears due to their composition of proteins, electrolytes, and mucus. Understanding these mechanisms could lead to new treatments for dry eyes in humans and enhance our knowledge of tear functions.

What is the origin of the phrase 'crocodile tears'?

• A scientific study on crocodile behavior

• A myth about crocodiles showing fake remorse

• A historical event involving crocodiles

• A popular children's story

Why did researchers choose alligators and caymans for their study instead of crocodiles?

• Crocodiles are too small

• Crocodiles are too aggressive and agile

• Alligators and caymans are more common

• Crocodiles do not have tear ducts

What causes the frothing and bubbling observed in the eyes of these reptiles?

• Lack of moisture

• Excessive blinking

• High water temperature

• Proteins in the tear film

How do crocodilian tear films compare to human tear films in terms of stability?

• Human tear films are more stable

• Both are equally stable

• Crocodilian tear films are less stable

• Crocodilian tear films are more stable

What components are found in crocodilian tear films that contribute to their stability?

• Only electrolytes

• Only water

• Proteins, electrolytes, and mucus

• Vitamins and minerals