Biology Grade 9 unit 3 part thirteen

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blood is the transport medium in circulatory system
blood is a complex mixture of cells and liquid
It consists of
plasma-a liquid
red blood cells(RBCs)
white blood cells(WBCs) and
platelets.
They are much bigger than the red cells
are fewer in number than RBCs
They have a nucleus
form part of the body’s defence system against microbes.
WBCs can be two types
the lymphocytes
form antibodies against microbes whilst others
the phagocytes
engulf invading bacteria.
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