- blood is a fluid connective tissue because of its mesenchymal origin and low cell to liquid intercellular substance (blood plasma)
- in human adult about 5 liter \(7-8%) of the weight.
- blood made up of two parts: formed elements (blood cells) and plasma
- plasma: the liquid in which formed elements suspended
pathology of WBCs:
- leukopenia: is a decrease in white blood cell number. its a characteristics of the initial stage of viral infection. it may also be due to other condition.
- leukocytosis: is an increase in the number of leukocytes, principally neutrophils, and it may occurs as a response to bacterial infection.
- leukemia: is a pathologic increase in number of WBCs. the term denotes a type of neoplastic disease.
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