 |
Business | Industries | Finance | Tax |
| Index: > A B C D E F G H I J K L M N O P Q R S T U V W X Y Z |
|
|||||
| First Prev [ 1 2 ] Next Last |
Tears flow from the eyes through lacrimal duct s located at the inner corner of each eye. Lacrimal fluid often flows into the nasal duct, causing the nose to run.
There are three basic types of tears. In healthy mammalian eyes, the cornea is continually kept wet and nourished by basal tears. They lubricate the eye and help to keep it clear of dust. Tear fluid contains water, mucin, lipids, lysozyme, immunoglobulins, glucose, urea, sodium, and potassium. Some of the substances in lacrimal fluid fight against bacterial infectionInfection" is also the title of an episode of the television series Babylon 5; see Infection (Babylon 5). An infection is the detrimental colonization of a host organism by a foreign species. The colonizing organism interferes with the normal functioning as a part of the immune systemThe immune system is any system present in an organism to prevent predation by biological agents. All living organisms have these protective measures, although they vary radically in scope and mechanism. In humans and domesticated animals, the immune syst.
The second type of tears results from irritation to the eye by foreign particles, or substances such as onion vapors, tear gas, or pepper sprayPepper spray is a less-lethal chemical agent which is used in riot control and personal self-defense. The active ingredient in pepper spray is capsaicin, which is a chemical derived from the fruit of plants in the Capsicum genus, including chiles. Pepper. These reflex tears attempt to wash out irritants that may have gotten into the eye.
The third category, also referred to as crying or weeping, is increased lacrimation due to strong emotional stress or pain. In humans, emotional tears can be accompanied by reddening of the face and sobbing — cough-like, convulsive breathing, sometimes involving spasms of the whole upper body.
Tears brought about by emotions have a different chemical make up than those for lubrication. It has been suggested from their stress hormoneNote that "Hormone" is the NATO reporting name for the Soviet/Russian Kamov Ka-25 military helicopter. A hormone (from Greek horman "to set in motion") is a chemical messenger from one cell (or group of cells) to another. All multicellular organisms (incl content that tears may be a method of expelling excess hormones from the body.
MeniscometryMeniscometry is a minimally invasive test, which is particularly useful in assessing tear volume indirectly by measuring tear meniscus radius. is used to evaluate tear volume over the ocular surface.Most mammals will produce tears in response to extreme pain or other stimulus, but crying as an emotional reaction is considered by many to be a uniquely human phenomenon, possibly due to humans' advanced self-awarenessSelf-awareness is the ability to perceive one's own existence, including one's own traits, feelings and behaviours. In an epistemological sense, self-awareness is a personal understanding of the very core of one's own identity. It is the basis for many ot. Some studies suggest that elephantThis page is about the animal, see elephant (disambiguation) for more meanings. Loxodonta Loxodonta cyclotis Loxodonta africana Elephas Elephas maximus Proboscidea is an order including only one family, Elephantidae or the elephants with 3 species: the Sas and gorillas may cry as well.
In nearly all cultures, crying is seen as a specific act associated with tears trickling down the cheeks and accompanied by characteristic sobbing sounds. Emotional triggers are most often anger and grief, but crying can also be triggered by sadness, joy, fear, humor, et cetera.
In many cultures, crying is associated with babies and children. Some cultures consider crying to be undignified and infantile, casting aspersion on those who cry publicly. In most Western cultures, it is more societally acceptable for women to cry than men. In other cultures, the reverse is true.
An insincere display of grief or dishonest remorse is called crocodile tears, from the mistaken notion that crocodiles would weep over their prey.
Many religions describe gods or prophets as crying. The shortest verse in the Christian Bible (in English) is simply: " Jesus wept". Jade is sometimes known as tears of the Buddha. The Koran describes Mohammed crying, and proclaiming: "This is an expression of the tenderness and compassion, which the Lord hath put into the hearts of His servants."
| Politics | Business | Finance |
 |
 |
 |
|