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Why do we cry? The three types of tears

Paula Tatés and Emilia Cajas

Iris

Why do we cry?

Tipes of tears

We cry thirty gallons in a year!

All of us cry when we are happy, sad or when things just get to us.

Basal tears

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The basal tears that Iris constantly produces form a thin coating of three layers that cover her and keep dirt and debris away

-When we cut an onion we cry and this is called :

Syn-Propanethial S-oxide

Reflex tears

We have special lacrimal glands to make new tears and special tubes, called lacrimal puncta to drain old ones away.

The gas stings us; these are the:

- They are designed to wash away harmful substances of particles

Reflex tears

Emotional tears

When someone is either too sad or too happy you cry; this contains higher levels of stress hormones

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