Why Are Our Tears Salty? Understanding the Different Types of Tears

The video explores the different types of human tears: basal, reflex, and psychic. Basal tears keep the eyes moist and protect against pathogens. Reflex tears respond to irritants, while psychic tears are linked to emotions and have a unique composition. Tears are salty due to electrolytes like sodium and potassium, which are essential for nerve function and eye health.

What are basal tears primarily composed of?

• Proteins and hormones

• Water, lipids, and electrolytes

• Only water

• Only lipids

What triggers reflex tears?

• Lack of sleep

• Emotional experiences

• Exposure to bright light

• Intense external stimuli

Which system in the brain controls the production of psychic tears?

• Respiratory system

• Endocrine system

• Central nervous system

• Limbic system

What is a unique component found in psychic tears?

• Leucine enkephalin

• Potassium

• Lipids

• Sodium

Why do tears have a salty taste?

• They contain sugar

• They contain electrolytes like sodium and potassium

• They contain acids

• They are made of pure water

What percentage of tears is made up of pure water?

• 100%

• 98%

• 75%

• 50%

How do tears contribute to eye health?

• By providing nutrients

• By creating a hostile environment for bacteria

• By increasing blood flow

• By reducing eye pressure