Dr Daniel J Bell et al.

Blood is a connective tissue usually found in a liquid phase; it comprises a fluid component called plasma (about 55% of the total volume), in which lies the cellular component, comprising several cell lineages, primarily the white blood cells, red blood cells and platelets. In an average adult male the total volume of blood is ~5.5 liters.


Plasma is predominantly composed of water (about 90%) in which both organic substances (such as amino acids, proteins and glucose) and inorganic salts are dissolved. Its physiological pH is slightly basic: 7.4.

Article information

rID: 71799
System: Haematology
Section: Pathology
Tag: stub
Synonyms or Alternate Spellings:
  • Plasmas
  • Bloods
  • Blood cell
  • Blood cells
  • Plasma

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