Blood tests such as blood count tests help doctors check for certain diseases and conditions.
Blood Components
They also help check the function of your organs and show how well treatments are working. Problems with your blood may include bleeding disorders , excessive clotting and platelet disorders. If you lose too much blood, you may need a transfusion. On this page Basics Summary Start Here.
Learn More Related Issues Specifics. See, Play and Learn Videos and Tutorials. Research Clinical Trials Journal Articles. Resources Reference Desk Find an Expert. For You Children Teenagers. National Heart, Lung, and Blood Institute. Blood Types American Red Cross. In modern evidence-based medicine , bloodletting is used in management of a few rare diseases, including hemochromatosis and polycythemia.
However, bloodletting and leeching were common unvalidated interventions used until the 19th century, as many diseases were incorrectly thought to be due to an excess of blood, according to Hippocratic medicine. The modern German word is das Blut. When blood is drawn in a glass container and left undisturbed for about an hour, four different layers can be seen.
A dark clot forms at the bottom the "black bile". Above the clot is a layer of red blood cells the "blood". Above this is a whitish layer of white blood cells the "phlegm". The top layer is clear yellow serum the "yellow bile".
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In the first blood transfusion was performed that used the ABO system to predict compatibility. The Rhesus factor was discovered in Due to its importance to life, blood is associated with a large number of beliefs. This bears closely to bloodlines , and sayings such as " blood is thicker than water " and " bad blood ", as well as " Blood brother ".
Blood is given particular emphasis in the Jewish and Christian religions, because Leviticus Mythic references to blood can sometimes be connected to the life-giving nature of blood, seen in such events as childbirth, as contrasted with the blood of injury or death. In many indigenous Australian Aboriginal peoples' traditions, ochre particularly red and blood, both high in iron content and considered Maban , are applied to the bodies of dancers for ritual. In many Aboriginal rituals and ceremonies, red ochre is rubbed all over the naked bodies of the dancers.
In secret, sacred male ceremonies, blood extracted from the veins of the participant's arms is exchanged and rubbed on their bodies. Red ochre is used in similar ways in less-secret ceremonies. Blood is also used to fasten the feathers of birds onto people's bodies. Bird feathers contain a protein that is highly magnetically sensitive. Lawlor comments that blood employed in this fashion is held by these peoples to attune the dancers to the invisible energetic realm of the Dreamtime.
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Lawlor then connects these invisible energetic realms and magnetic fields , because iron is magnetic. The blood was considered to have the power of its originator, and, after the butchering, the blood was sprinkled on the walls, on the statues of the gods, and on the participants themselves. The Hittite word for blood, ishar was a cognate to words for "oath" and "bond", see Ishara.
The Ancient Greeks believed that the blood of the gods, ichor , was a substance that was poisonous to mortals. As a relic of Germanic Law, the cruentation , an ordeal where the corpse of the victim was supposed to start bleeding in the presence of the murderer, was used until the early 17th century. This command continued to be observed by the Eastern Orthodox.
It is also found in the Bible that when the Angel of Death came around to the Hebrew house that the first-born child would not die if the angel saw lamb's blood wiped across the doorway. At the Council of Jerusalem , the apostles prohibited certain Christians from consuming blood—this is documented in Acts This chapter specifies a reason especially in verses 19— It was to avoid offending Jews who had become Christians, because the Mosaic Law Code prohibited the practice.
What is Blood? | OneBlood
Christ's blood is the means for the atonement of sins. Some Christian churches, including Roman Catholicism, Eastern Orthodoxy , Oriental Orthodoxy , and the Assyrian Church of the East teach that, when consecrated, the Eucharistic wine actually becomes the blood of Jesus for worshippers to drink. Thus in the consecrated wine, Jesus becomes spiritually and physically present. This teaching is rooted in the Last Supper , as written in the four gospels of the Bible, in which Jesus stated to his disciples that the bread that they ate was his body, and the wine was his blood.
Most forms of Protestantism, especially those of a Wesleyan or Presbyterian lineage, teach that the wine is no more than a symbol of the blood of Christ, who is spiritually but not physically present. Lutheran theology teaches that the body and blood is present together "in, with, and under" the bread and wine of the Eucharistic feast. In Judaism , animal blood may not be consumed even in the smallest quantity Leviticus 3: Blood is purged from meat by rinsing and soaking in water to loosen clots , salting and then rinsing with water again several times. Another ritual involving blood involves the covering of the blood of fowl and game after slaughtering Leviticus In relation to human beings, Kabbalah expounds on this verse that the animal soul of a person is in the blood, and that physical desires stem from it.
Likewise, the mystical reason for salting temple sacrifices and slaughtered meat is to remove the blood of animal-like passions from the person. By removing the animal's blood, the animal energies and life-force contained in the blood are removed, making the meat fit for human consumption. Consumption of food containing blood is forbidden by Islamic dietary laws. This is derived from the statement in the Qur'an , sura Al-Ma'ida 5: Blood is considered unclean, hence there are specific methods to obtain physical and ritual status of cleanliness once bleeding has occurred.
Specific rules and prohibitions apply to menstruation , postnatal bleeding and irregular vaginal bleeding. When an animal has been slaughtered, the animal's neck is cut in a way to ensure that the spine is not severed, hence the brain may send commands to the heart to pump blood to it for oxygen. In this way, blood is removed from the body, and the meat is generally now safe to cook and eat. In modern times, blood transfusions are generally not considered against the rules. Based on their interpretation of scriptures such as Acts Members may personally decide whether they will accept medical procedures that involve their own blood or substances that are further fractionated from the four major components.
In south East Asian popular culture , it is often said that if a man's nose produces a small flow of blood, he is experiencing sexual desire. This often appears in Chinese-language and Hong Kong films as well as in Japanese and Korean culture parodied in anime , manga , and drama. Characters, mostly males, will often be shown with a nosebleed if they have just seen someone nude or in little clothing, or if they have had an erotic thought or fantasy; this is based on the idea that a male's blood pressure will spike dramatically when aroused. Vampires are mythical creatures that drink blood directly for sustenance, usually with a preference for human blood.
Cultures all over the world have myths of this kind; for example the ' Nosferatu ' legend, a human who achieves damnation and immortality by drinking the blood of others, originates from Eastern European folklore. Ticks , leeches , female mosquitoes , vampire bats , and an assortment of other natural creatures do consume the blood of other animals, but only bats are associated with vampires.
This has no relation to vampire bats, which are new world creatures discovered well after the origins of the European myths. Blood residue can help forensic investigators identify weapons, reconstruct a criminal action, and link suspects to the crime. Through bloodstain pattern analysis , forensic information can also be gained from the spatial distribution of bloodstains. Blood residue analysis is also a technique used in archeology.
What is blood?
Blood is one of the body fluids that has been used in art. Marc Quinn has made sculptures using frozen blood, including a cast of his own head made using his own blood. The term blood is used in genealogical circles to refer to one's ancestry , origins , and ethnic background as in the word bloodline. Other terms where blood is used in a family history sense are blue-blood , royal blood , mixed-blood and blood relative.
From Wikipedia, the free encyclopedia. For other uses, see Blood disambiguation. Reference ranges for common blood tests. This section needs additional citations for verification. Please help improve this article by adding citations to reliable sources. Unsourced material may be challenged and removed. July Learn how and when to remove this template message. This article needs additional citations for verification. October Learn how and when to remove this template message. Jehovah's Witnesses and blood transfusions.
Blood portal Autotransfusion Blood as food Blood donation Blood pressure Blood substitutes "artificial blood" Blood test Hemophobia List of human blood components Luminol , a visual test for blood left at crime scenes. Taboo food and drink: Blood Octenone "Smell" of blood. Archived from the original on 23 March Retrieved 4 March Archived from the original on 5 March Red cells, white cells and platelets are made in the marrow of bones, especially the vertebrae, ribs, hips, skull and sternum. These essential blood cells fight infection, carry oxygen and help control bleeding.
Red blood cells are disc-shaped cells containing hemoglobin, which enables the cells to pick up and deliver oxygen to all parts of the body, then pick up carbon dioxide and remove it from tissues. White cells are the body's primary defense against infection.
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They can move out of the blood stream and reach tissues to fight infection. There are very specific ways in which blood types must be matched for a safe transfusion.
Mother who lost infant in attack: The blood of Israel pulses through my veins
Rollover blood group to view compatibility. Donor O Group O can donate red blood cells to any recipients. Did you know there is more than one type of blood donation?