Aren t tears water, and what are the tears of water?

It's still water, and human tears are water, so isn't it the same with water?

Tears are a weakly acidic, clear, colorless liquid composed of mostly water (, and contain small amounts of inorganic salts, proteins, lysozyme, immunoglobulin A, complement system, and other substances. There are two types of tearing: reflexive tearing and emotional tearing.

Affective tearing contains more protein than reflex tearing, and affective tearing has a chemical that resembles painkillers. The lactoferrin and lysin in tears have defensive functions and can inhibit the growth of bacteria. In addition, the secretion of tears promotes the normal metabolism of cells and prevents them from forming tumors.

Tears come from the lacrimal glands. The lacrimal gland is made up of thin tubular glands and ducts, and it is the organ that secretes tears. The lacrimal gland is located in the lacrimal gland fossa above the outer orbit and is divided into two parts: upper and lower

The upper part is the orbit, also called the upper lacrimal gland, which is larger, and the shape is very similar to an almond, about 12 mm 20 mm; The lower part is the eyelids, also called the inferior lacrimal glands, which are smaller. The lacrimal gland has 10 12 excretory ducts, and the tear is excreted from these excretory ducts after it is produced. Under normal circumstances, the tear glands secrete tears during the day, which moisten the conjunctiva and cornea of the eyeball, and stop secreting tears when the person is sleeping.

Tears are a weakly alkaline transparent liquid, in which water is the rest, and the rest are small amounts of inorganic salts and proteosomes, as well as other substances such as lysozyme, immunoglobulin A, complement system, etc. After tears are produced, they are excreted through the tear ducts. The lacrimal duct consists of puncta, lacrimal tubules, lacrimal sacs, and nasolacrimal ducts.

Tears enter the lacrimal duct like a sewer from the lacrimal dot and enter the lacrimal sac through the lacrimal tubule about 10mm long, which is specially used to collect and store tears and prevent tears from flowing out. The size of the lacrimal sac is about 12 mm 6 mm, and there is a tube 12 24 mm long and 3 6 mm in diameter directly under the lacrimal sac that leads directly to the nasal cavity, which is the nasolacrimal duct, and the tears in the lacrimal sac enter the nasal cavity through the nasolacrimal duct. So when we order eye drops, we should press down on the base of the nose with our fingers, just to prevent the eye drops from flowing into the nasal cavity through the nasolacrimal ducts.

Tears do not exactly indicate a change in mood. When a foreign object such as dust falls into our eyes, a large number of tears are generated and the foreign body is washed out. In addition to a large amount of water, there are lysozyme, immunoglobulins, complement system, lactoferrin, -lysin, etc., which have the effect of inhibiting the growth of bacteria.

Therefore, tears have another very important function - defense. In addition, tears can also moisten the surface of the eyeball, moisten the conjunctival sac, and change the optical properties of the cornea. Tears are evenly distributed in the conjunctival sac to form a thin film of liquid, which is medically called tear film.

The tear film that sits in front of the cornea is called the precorneal tear film.

Tears are ionic water, happy water, painful water, grievance water, bitter water, children's water, old people's water, women's water, and men's water.

Tears, both tears. There are tear glands on the outside of the eyeball, and the fluid that is secreted is tears. Tears are made from blood and processed from the lacrimal glands.

After the tears are drained from the lacrimal glands, they enter the lacrimal sac, which is located within the conjunctiva. It is then drained into the tear ducts. Tears are 99% water, but also contain salts, lysozyme that can dissolve traces or bacteria, a small amount of protein, immunoglobulin A, etc.

Under normal circumstances, the amount of tear secretion is generally sufficient to moisten the conjunctival and corneal surfaces to prevent dryness. If the lacrimal gland produces too much tears, which exceeds the normal discharge of the tear duct, runs out of the eye socket and flows to the cheeks, it is called tearing. In addition to moistening the cornea and conjunctiva to prevent dryness, tears also have disinfecting and sterilizing effects.

When tears flow into the mouth, the person will feel a salty taste. Why are tears salty? Scientists used the method of microanalysis to find that in people's tears, 99 is water, 1 is solid, and more than half of this solid is salt, no wonder it has a salty taste!

It turns out that there is a gland the size of a little finger on the outer top of the eyeball, called the lacrimal gland, which is made of blood as raw material and processed to produce tears. And we know that in the blood, body fluids and tissue fluids of the human body contain salt, it is not surprising that there is salt in tears made of blood. Salt accounts for 0 9 in blood and 0 6 in tears.

Tears contain not only salt, but also enzymes that dissolve bacteria, which have a bactericidal and slightly disinfecting effect on the eyes. In addition, the surface of the black eye is often coated with a thin layer of tears, which can moisten the cornea so that it does not dry out and cloudy due to direct exposure to the air.

Bitter tears.

bitter acid [ xīn suān ].

Basic Definition of New Words Detailed Definition.

xīn suān ]

Spicy and sour, metaphor for pain and sorrow: tears. of the past.

Near antonyms. synonyms: sad, sad, sour, bitter, antonyms: sweet, joy, sweet.

Tears of happiness, tears of loneliness

Tears of sadness, tears of crystalline

Tears of sadness, tears of excitement

Hot) tears, (frustrated) tears

bitter) tears, (sad) tears.

Tears of somethingBitter tears. Bitter tearsTears of happiness

Bittersweet and sour tears. Tears of happiness