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Grade: 11
        
Tears are secreated by which part of the eye and for wht purpose ?
 
3 years ago

Answers : (4)

Umakant biswal
5349 Points
							
@ guneet
The lacrimal-glands are paired, almond-shaped glands, one for each eye, that
secrete the aqueous-layer of the tear film. They are situated in the upper-outer portion of each orbit, in the lacrimal fossa of the orbit formed by the frontal-bone. 
they are one of the emotional barrier and it even also protects the eye from attack of pathogen and it helps all the dust particle and foreign material to come out from the eye . 
HOPE IT CLEARS YOUR DOUBT 
ALL THE BEST ..

 
3 years ago
SAHIL
3783 Points
							
  Lacrimal glands, which produce tears, are found on the outer part of each eye. Tears are necessary to give you good vision and keeps you eye health and moisturized. they are of three types:
1. Emotional tears
2. Basal tears
3. Reflex tears
fact: I have studien somewhere that the shape of tears of happiness is different from shapes of sadness
thanks
keep posting your doubts
 
3 years ago
dolly bhatia
54 Points
							
Tearing, lacrimation or lachrymation is the secretion of tears, which serves to clean and lubricate eyes in response to an irritation of eyes. Tears formed through crying are associated with strong internal emotions like sorrow, elation, love, awe or pleasure. Laughing or yawning may also lead to production of tears.
Lacrimal glands secrete lacrimal fluid, which flows through main excretory ducts into the space between the eyeball and lids. When eyes blink, lacrimal fluid is spread across the surface of the eye. Lacrimal fluid gathers in lacrimal lake and is drawn into the puncta by capillary action, then flows through lacrimal canaliculi at inner corner of eyelids entering the lacrimal sac, then on to nasolacrimal duct and finally into nasal cavity. An excess of tears, as with strong emotion, can thus cause the nose to run.
 Tears are necessary to give you goof vision, keep your eyes healthy and protect them from irritants.
Emotional tears – caused by strong feelings of happiness, sadness or pain – are different from tears produced, for example, from peeling an onion and may contain hormones and chemicals released by the body.
Crying may make your eyes red and puffy but they will not affect your eyesight –you can’t literally ‘cry your eyes out’.
There are three types of tear, with each containing a combination of water, fats, sugars and proteins. They all play important role in protecting and preserving the condition of our eyes:
Basal Tears:-
This is the liquid constantly present in the eye, which ensures that cornea is always wet and nourished.
Cornea itself has no blood vessels and is dependent on the tear film for its oxygen supply, which it gets from air when the eye is open.  The thin layer of liquid also smoothes out irregularities and creates an even surface of good optical quality, which is re-formed every time one blinks.
The washing action of the liquid tear film reduces ability of bacteria to adhere to surface of eye, while antibiotic proteins in the liquid help kill them off. Basal tears also act as a lubricant to l9imit impact of friction on the eye caused by movement of eyelid.
Reflex Tears:
These tears are the same as basal tears but are a result of an increase in level of liquid the eye produces in response to a sudden external stimulus. This could be due to irritation of the eye by foreign particles like dust or from irritant substances like onion vapours, tear gas or pepper spray. By creating a sudden increase in level of basal tears, this reflex serves to wash out irritants which may have come in contact with the eye and makes our eyes, ‘water’.
Emotional Tears:
Crying due to pain, anger or happiness is often accompanied with spasms of whole body and interrupted breathing patterns.
Tears brought about by emotion are shown to contain a different chemical make-up than to those of basal or reflex tears in that they have more protein. A high level of emotions can trigger parasympathetic branch of autonomic system and will cause glands near your eyes to produce tears. By excreting these hormones in form of tears, the body is helping you feel calmer and less emotional afterwards.
Epiphora:
This is the name for an overflow of tears. This can be reflex or emotional but can also be a result of a drainage failure, where small draining holes in one’s eyelids fail to drain tears away efficiently into one’s nose. This can lead to leakage and excess of water on surface of cornea, which can cause a ‘watery eye’ and blurring of vision. It can be made worse by cold winds or dry conditions:
When we blink, tears lubricate, nourish and protect the front of the eye.
Tears have three main components: The lachrymal gland produces a watery component, glands in our eyelids produce an oily component, while other cells produce a mucus.
These mix together to create a film which covers the white of the eye and the cornea.
When we blink, the film is wiped across the eye by eyelids.
If insufficient tears are produced or constituents are out of balance, it can result in sore, dry eyes.
Wearing glasses can help reduce tear evaporation
In few cases, tears can be kept in the eye for longer time by plugging tear ducts. 
3 years ago
Omkar Charapale
38 Points
							
Tearing  is the secretion of tears, which often serves to clean and lubricate the eyes in response to an irritation of the eyes. Tears formed through crying are associated with strong internalemotions, such as sorrowelationloveawe or pleasureLaughing or yawning may also lead to the production of tears.
3 years ago
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