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Closed Three Types of Tears

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1. basal Tears

Throughout the day, the eye produces tears to protect itself and keep from drying out. Depending on the size of the eye, the average human makes anywhere from just over one-half to just over one cup of You do not have permission to view the full content of this post. Log in or register now. every day.
These You do not have permission to view the full content of this post. Log in or register now.:

Contain water, nutrients and antibacterial components such as glucose, mucin (sticky stuff), lysozyme (antibacterial), lactoferrin (antibiotic), lipocalin (protein transporter), urea, potassium and sodium.

So many basal tears are required because during the day:

Some of the fluid evaporates between blinks and some is drained through small permanent openings at the nose end of each eyelid

2.Reflex Tears

Protecting the eye from irritants, You do not have permission to view the full content of this post. Log in or register now. result from a message sent from the cornea to the brain stem, which then “sends a hormonal signal to [the] lachrymal glands causing the tear response to kick in.” Intended to You do not have permission to view the full content of this post. Log in or register now., unlike basal tears, reflex tears:

Are designed to break down and eliminate eyeball-intruders like airborne dust [so] these tears tend to flow in greater amounts and probably contain a greater concentration [when compared to basal tears] of antibodies and enzymes that target micro-organisms.

3.Emotional Tears

Humans are the only species You do not have permission to view the full content of this post. Log in or register now., and unlike the other two, You do not have permission to view the full content of this post. Log in or register now. involve nerve impulses that stimulate the cerebrum:

Where sadness is registered. The endocrine system is then triggered to release hormones to the ocular area, which then causes tears to form.

Many scientists believe that emotional crying helps eliminate You do not have permission to view the full content of this post. Log in or register now. from the body.

Bonus Crying Facts:
Women cry (emotionally) “You do not have permission to view the full content of this post. Log in or register now..” Some attribute this difference, at least in part, to the prolactin in tears – a female hormone and protein that enables women to produce ****** milk. Others believe the difference is explained by cultural forces and expectations.
 
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