Blood squirt (blood spurt, blood spray, blood gush, or blood jet) is a projectile expulsion of

blood Blood is a body fluid in the circulatory system of humans and other vertebrates that delivers necessary substances such as nutrients and oxygen to the cells, and transports metabolic waste products away from those same cells. Blood is com ...

when an

artery An artery () is a blood vessel in humans and most other animals that takes oxygenated blood away from the heart in the systemic circulation to one or more parts of the body. Exceptions that carry deoxygenated blood are the pulmonary arteries in ...

is ruptured.

Blood pressure Blood pressure (BP) is the pressure of Circulatory system, circulating blood against the walls of blood vessels. Most of this pressure results from the heart pumping blood through the circulatory system. When used without qualification, the term ...

causes the blood to bleed out at a rapid, intermittent rate in a spray or jet, coinciding with the

pulse In medicine, the pulse refers to the rhythmic pulsations (expansion and contraction) of an artery in response to the cardiac cycle (heartbeat). The pulse may be felt ( palpated) in any place that allows an artery to be compressed near the surfac ...

, rather than the slower, but steady flow of

venous Veins () are blood vessels in the circulatory system of humans and most other animals that carry blood towards the heart. Most veins carry deoxygenated blood from the tissues back to the heart; exceptions are those of the pulmonary and fetal c ...

bleeding. Also known as arterial bleeding, arterial spurting, or arterial gushing, the amount of blood loss can be copious, occur very rapidly, and can lead to death by

exsanguination Exsanguination is the loss of blood from the circulatory system of a vertebrate, usually leading to death. The word comes from the Latin 'sanguis', meaning blood, and the prefix 'ex-', meaning 'out of'. Exsanguination has long been used as a met ...

Anatomy

In cut

carotid arteries In anatomy, the left and right common carotid arteries (carotids) () are arteries that supply the head and neck with oxygenated blood; they divide in the neck to form the external and internal carotid arteries. Structure The common carotid ...

with 100 mL of blood through the heart at each beat (at 65 beats a minute), a completely severed artery will spurt blood for about 30 seconds and the blood will not spurt much higher than the human head. If the artery is just nicked, on the other hand, the blood will spurt longer, but will be coming out under pressure and spraying much further. To prevent

hand A hand is a prehensile, multi-fingered appendage located at the end of the forearm or forelimb of primates such as humans, chimpanzees, monkeys, and lemurs. A few other vertebrates such as the Koala#Characteristics, koala (which has two thumb#O ...

ischemia Ischemia or ischaemia is a restriction in blood supply to any tissue, muscle group, or organ of the body, causing a shortage of oxygen that is needed for cellular metabolism (to keep tissue alive). Ischemia is generally caused by problems ...

, there is a "squirt test" that involves squirting blood from the

radial artery In human anatomy, the radial artery is the main artery of the lateral aspect of the forearm. Structure The radial artery arises from the bifurcation of the brachial artery in the antecubital fossa. It runs distally on the anterior part of the ...

, which is used in

intraoperative The perioperative period is the period of a patient's surgical procedure. It commonly includes ward admission, anesthesia, surgery, and recovery. Perioperative may refer to the three phases of surgery: preoperative, intraoperative, and postoperat ...

assessment of collateral arm blood flow before radial artery

harvest Harvesting is the process of collecting plants, animals, or fish (as well as fungi) as food, especially the process of gathering mature crops, and "the harvest" also refers to the collected crops. Reaping is the cutting of grain or pulses fo ...

. This is more commonly called "

Allen's test In medicine, Allen's test or the Allen test is a medical sign used in physical examination of arterial blood flow to the hands. It was named for Edgar Van Nuys Allen, who described the original version of the test in 1942. An altered test, first ...

" by microvascular surgeons, and is used before harvesting radial artery based free tissue transfers. In 1933, a

murder Murder is the unlawful killing of another human without justification (jurisprudence), justification or valid excuse (legal), excuse committed with the necessary Intention (criminal law), intention as defined by the law in a specific jurisd ...

trial In law, a trial is a coming together of parties to a dispute, to present information (in the form of evidence) in a tribunal, a formal setting with the authority to adjudicate claims or disputes. One form of tribunal is a court. The tribunal, w ...

prompted a testimony from Dr. Clement Harrisse Arnold about how far blood could spurt from the neck: vertically and laterally.

Iconography

Chinnamasta Chhinnamasta (, :"She whose head is severed"), often spelled Chinnamasta, and also called Chhinnamastika, Chhinnamasta Kali, Prachanda Chandika and Jogani Maa (in western states of India), is a Hindu goddess (Devi). She is one of the Mahavi ...

, a self-decapitated Hindu goddess, is depicted holding her head with three jets of blood spurting out of her bleeding neck, which are drunk by her severed head and two attendants. Saint Miliau, a Christian martyr killed c. 6th century AD, is sometimes represented holding his severed head, as in the

retable A retable is a structure or element placed either on or immediately behind and above the altar or communion table of a church. At the minimum, it may be a simple shelf for candles behind an altar, but it can also be a large and elaborate struct ...

of the Passion of the Christ at Lampaul-Guimiliau, where blood gushes from his neck.

Insects and animals

Some animals deliberately

autohaemorrhage Autohaemorrhaging, or reflex bleeding, is the action of animals deliberately ejecting blood from their bodies. Autohaemorrhaging has been observed as occurring in two variations. In the first form, blood is squirted toward a predator. The blood of ...

or squirt blood (or an analogous bodily fluid) as a

defense mechanism In psychoanalytic theory, defence mechanisms are unconscious psychological processes that protect the self from anxiety-producing thoughts and feelings related to internal conflicts and external stressors. According to this theory, healthy ...

. Armored crickets, which are native to Namibia, South Africa, and Botswana, drive away predators by spewing

vomit Vomiting (also known as emesis, puking and throwing up) is the forceful expulsion of the contents of one's stomach through the mouth and sometimes the nose. Vomiting can be the result of ailments like food poisoning, gastroenteritis, pregna ...

and spurting

hemolymph Hemolymph, or haemolymph, is a fluid, similar to the blood in invertebrates, that circulates in the inside of the arthropod's body, remaining in direct contact with the animal's tissues. It is composed of a fluid plasma in which hemolymph c ...

(the mollusk and arthropod equivalent of blood) from under their legs and through slits in their exoskeleton.

Katydid Insects in the family Tettigoniidae are commonly called katydids (especially in North America) or bush crickets. They have previously been known as "long-horned grasshoppers". More than 8,000 species are known. Part of the suborder Ensifera, the ...

s do it too, and in Germany the species has acquired the nickname "Blutspritzer", or "blood squirter". The

regal horned lizard The regal horned lizard (''Phrynosoma solare'') is a horned lizard species native to Mexico and the Southwest United States. Description The regal horned lizard is a small, flat lizard about the size of the palm of a human's hand. It has spike ...

also uses the blood-spewing tactic, shooting the substance from a pocket near its eyes."See It to Believe It: Animals Vomit, Spurt Blood to Thwart Predators"
, Allison Bond, ''

Discover Discover may refer to: Art, entertainment, and media * ''Discover'' (album), a Cactus Jack album * ''Discover'' (magazine), an American science magazine * "Discover", a song by Chris Brown from his 2015 album ''Royalty'' Businesses and bran ...

'' blog, 28 July 2009, retrieved 17 March 2010 One of the

oriental rat flea The Oriental rat flea (''Xenopsylla cheopis''), also known as the tropical rat flea or the rat flea, is a parasite of rodents, primarily of the genus ''Rattus'', and is a primary Vector (epidemiology), vector for bubonic plague, plague and murine ...

mouth's two functions is to squirt partly

digested Digestion is the breakdown of large insoluble food compounds into small water-soluble components so that they can be absorbed into the blood plasma. In certain organisms, these smaller substances are absorbed through the small intestine into th ...

blood into a bite.

References

{{reflist

External links

Video - Freak of Nature: Blood-Squirting Lizard
at

National Geographic ''National Geographic'' (formerly ''The National Geographic Magazine'', sometimes branded as ''Nat Geo'') is an American monthly magazine published by National Geographic Partners. The magazine was founded in 1888 as a scholarly journal, nine ...

Squirt Special effects

Anatomy

Iconography

Insects and animals

See also

References

External links