What are tears made of?

Question

What are a human's tears made up of. Is it just salty water?

Answer 1

yes water and salt

Answer 2

Tears aren't just salty water...tears are made of tear film, a microscopically three-layered structure.

Each tear has three layers: an inner layer of mucus, a middle layer of proper water, and an outer layer of fatty substances called meibum.

Below is a link to an awesome read on the discovery of meibum,  which is a class of fatty substance previously only known in the brain, where it induces sleep.

Answer 3

Your brain sends signals to your optic nerve causing the macula to gather salty water that is released (much like a super-soaker) by the Iris. Heart-break, sad movies, pinching, intense laughter, etc. are common causes of tears

Answer 4

yes :)

Answer 5

Salt + Water = Human tears