If you think tears are only one type, you are wrong, there are 3 types of muscles

Do you believe when each of us produces 300ml of tears every day, ie about 113 liters per year .

Everyone in the world sometimes has to cry. We cry when we are sad, when we are happy and even when something tiny like sand grains accidentally flies into our eyes.

Believe it when each of us produces 300ml of tears every day, that's about 113 liters a year! But where does tears come from, is it only when you cry, you have tears - do you ever wonder?

Each type of tear has different functions and is extremely important.

The truth is . we have 3 types of tears - background tears, reflective tears and emotional tears . Each type has different functions and is extremely important.

According to Robert Provine - professor of neuroscience and psychology at the University of Maryland (USA), the most common tears are "basal tear".

This is the kind of tear that always exists in our eyes. It helps maintain eye moisture, improves eye function, and prevents infection.

Reflex tears will come out when you encounter some kind of agent, like when you have an onion or an eye disease .

Right next to the pupil is the mucous membrane, keeping everything firmly attached to it. Above the mucous membrane is a layer of water, which keeps your pupils wet, repels invasive bacteria and protects the cornea from injury. And the final coating is the lipid layer - an outer layer of oil that keeps the surface smooth and prevents the outer layer from evaporating.

Therefore, if you look closely, you will see our pupils always have tears in their eyes.

The second type of tear is "irritation tears" . They will come out like rain when you meet a certain agent, like when you have an onion or an eye disease .

Reflected tears are flushed out quite a lot and this layer of water contains more antibodies to prevent any microorganisms from entering as well as the biocides to help the eyes heal faster.

When too happy or too sad to lose control, tears of emotion will come out.

And when someone is too sad or happy . to lose control, "emotional tear" will come out to balance emotions.

However, many studies show that emotional tears contain a higher level of stress hormones such as ACTH and enkephalin endorphin and natural painkillers. However, they are capable of protecting pupils and signaling emotional state to others.