Characteristics of Blood.
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☆ Characteristics of Blood :
❍ Blood is thicker and heavier than water.
❍ It is slightly alkaline with pH between 7.35 and 7.45.
❍ Its volume in man varies from 5 to 6 litres.
❍ It forms 8 - 10 per cent of the body mass.
❍ It is saltish in taste.
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In humans, blood is an opaque red fluid, freely flowing but denser and more viscous than water. The characteristic colour is imparted by hemoglobin, a unique iron-containing protein. Hemoglobin brightens in colour when saturated with oxygen (oxyhemoglobin) and darkens when oxygen is removed (deoxyhemoglobin).
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