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- | ==== Blood Is Not Always Red ==== | + | ====== Blood ====== |
- | For people it is always red. But not every creature has red blood. | + | |
+ | ==== Oxygen | ||
+ | Oxygen in human blood is transported mainly by erythrocytes. In combination with hemoglobin, it forms oxygenated (not oxidized, there is no oxidation reaction between iron and oxygen) hemoglobin (oxyhemoglobin). In contrast, about 3 percent of oxygen is transported in dissolved form in plasma. [([[https:// | ||
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+ | ==== The Rh system ==== | ||
+ | The Rh system of human blood was discovered by Karl Landsteiner and Alexander S. Wiener. They were experimenting with the blood of rhesus monkeys at the time. The abbreviation " | ||
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+ | ==== Blue blood ==== | ||
+ | Octopuses and squids have blue blood. Instead of red hemoglobin, copper-containing hemocyanin acts as an oxygen transporter (hence the blue color). At low temperatures | ||
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+ | ==== Universal donor ==== | ||
+ | Which blood type is known as a " | ||
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+ | ==== The rarest blood type ==== | ||
+ | AB is the rarest of the AB0 system groups, and Rh- is always less numerous than Rh+. In western Europe, only 1 percent of the population has AB- blood. In the far east, Rh- is very rare, so in Japan, only 0.05 percent of people | ||
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