why do we cry?
21 iulie 2009 Tears flow from tear glands into your eyes through tiny tear ducts.
The tear glands are located under your upper lids, and when stimulated,
produce tears to form a thin film over your eyeballs. Every time you blink
the film spreads over your eyes to keep them moist and free of dust and
other irritants. Whether you are awake or asleep, happy or sad, this salty
fluid is always flowing from the tear glands.
Besides protecting your eyes, the tear glands produce more fluid when
your eyes are irritated. These extra tears are called reflex or irritant tears. And, when something makes you happy or sad, your tear
glands will produce emotional tears. Used tears then
drain down into two tiny openings on the brim of your upper and lower eyelids
at the inner edge of your eyes, which lead to the naso-lacrimal tear ducts
next to the bridge of your nose. From there, they are channeled into your
nasal cavity where they are swallowed or blown out with other nasal fluids.
If there are too many tears, they will overflow your lower lid and run
down your cheeks.
This disease is called Dry Eye Syndrome. People who have diseases like rheumatoid arthritis or lupus
often have this condition. They must use artificial tears up to every 10
to 15 minutes, and apply other medications to their eyes before going to
bed as part of the treatment to improve the condition of their eyes.
animal sheds emotional tears (as opposed to tears of irritation) as
Charles Darwin, confirmed in his book. But what causes emotional tears?
The philosopher William James, following Darwin, considered emotions to
be little different from reflexes occurring without prior rational
thought. Hormones certainly have some influence. Thus women cry more
and more easily than men. Neurologists are unsure of the precise
pathways of the nerves controlling the glands that release hormones,
let alone what happens in the brain to stimulate them. They have,
however, identified two different memory systems: one declarative and
one emotional.
Tears are
first a liquid process of lacrimation to clean and lubricate the eyes.
The word lacrimation may also be used in a medical or literary sense to
refer to crying. Strong emotions, such as sorrow or elation, may lead
to crying. In humans, the tear film coating the eye has three distinct
layers, from the most outer surface to the inner: The lipid layer,
contains oils; The aqueous layer contains water and other substances
such as proteins; The mucous layer contains mucin. Having a thin tear
film mucus layer may prevent you from wearing contact lenses. One
lacrimal or tear gland is located in each eye, behind the upper eyelid.
There are three types of tears: Basal tears, Reflex tears, Crying or
weeping (psychic tears):
Tears
brought about by emotions have a different chemical make up than those
for lubrication; emotional tears contain more of the protein-based
hormones prolactin, adrenocorticotropic hormone, and leucine enkephalin
(a natural painkiller) than basal or reflex tears. Crying is beneficial
to health and mental well-being. Crying will definitely help release
tension and emotional dams in the mind and body
a chemical that reacts with tears on the surface of your eyes. The chemical
reaction produces sulfuric acid which irritates your eyes. Interview friends,
family and neighbors to see what methods they use to keep from crying.
Do they cry or try not to cry when they peel or slice onions? Experiment
with other vegetables and fruits to determine if peeling , slicing, or chopping
any of them makes you cry.
Most animals that live in air produce tears to keep their eyes moist. Many
have eyelids and lashes that also help protect their eyes. Read about different
animals like turtles, owls and snakes and find at least three that do not
have eyelids. How do they protect their eyes?
The act of shedding tears is referred to as "weeping" or "crying."
- What do the following phrases or tears mean? Weeping Willow? Read it
and Weep? A Weeping Wound? Brought Tears to His/Her Eyes? The Weeping Wall?
Cry Baby? To Have a Good Cry? Crying Your Heart Out? Crocodile Tears? - Write a poem about, or draw a picture of, a weeping sky.
The salt in tears acts as an antiseptic and prevents eye infections. Read
the labels on eye care products at home, the grocery story, or the drug
store. Do any of them contain salt solutions or list saline or sodium chloride
as an ingredient? Find out what is in artificial tears, contact lens supplies,
and eye wash solutions
Intai
Dar sper ca dumneavoastra nu o sa puteti, desi sunteti, o spune o lume intreaga asta, 
Unele femei pot sa convietuiasca cu succes cu barbatii spritangii.
