Blood: Difference between revisions
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'''Blood''' is a bodily fluid found in most higher [[animal]]s. It is a [[liquid]] that serves to diffuse the [[oxygen]] necessary to [[life]] throughout the body, and to remove waste products. | |||
In [[vertebrate]]s, blood is red. It owes its colour to [[haemoglobin]], a [[respiratory pigment]] containing [[iron]], to which oxygen binds. Haemoglobin is the most efficient respiratory pigment found in nature. Other respiratory pigments with iron are [[myoglobin]] (red), [[chlorocruorin]] (green) and [[haemerythrin]] (violet). Some respiratory pigments use other elements. [[haemocyanin|Haemocyanin]] (blue) uses [[copper]]. Sea squirts (among others marine life) use a [[vanadium]] [[chromagen]] (bright green, blue, or orange) for its respiratory pigment. | |||
Blood is circulated by the muscular pump of the [[heart]]. It passes to the [[lungs]] (or in [[fish]], the [[gill]]s) to be oxygenated, and then is circulated throughout the body by the [[artery|arteries]]. It diffuses its oxygen by passing through tiny [[blood vessel]]s called [[capillary|capillaries]]. In its deoxygenated state, its bright red colour fades. It then returns to the heart through the [[vein]]s. | |||
Blood also removes poisons and waste products to the [[liver]], the [[kidney]]s, and the [[intestine]]s to allow them to be rejected from the body in [[urine]] and [[faeces]]. | |||
Revision as of 05:53, 3 August 2009
Blood is a bodily fluid found in most higher animals. It is a liquid that serves to diffuse the oxygen necessary to life throughout the body, and to remove waste products.
In vertebrates, blood is red. It owes its colour to haemoglobin, a respiratory pigment containing iron, to which oxygen binds. Haemoglobin is the most efficient respiratory pigment found in nature. Other respiratory pigments with iron are myoglobin (red), chlorocruorin (green) and haemerythrin (violet). Some respiratory pigments use other elements. Haemocyanin (blue) uses copper. Sea squirts (among others marine life) use a vanadium chromagen (bright green, blue, or orange) for its respiratory pigment.
Blood is circulated by the muscular pump of the heart. It passes to the lungs (or in fish, the gills) to be oxygenated, and then is circulated throughout the body by the arteries. It diffuses its oxygen by passing through tiny blood vessels called capillaries. In its deoxygenated state, its bright red colour fades. It then returns to the heart through the veins.
Blood also removes poisons and waste products to the liver, the kidneys, and the intestines to allow them to be rejected from the body in urine and faeces.