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The circulatory system — Biology STD 10 — Question

ICSE BoardEnglish MediumSTD 10BiologyThe circulatory system1 Mark
Question
Complete the following table :
ComponentsOriginFunctionApprox. No.
(per mm3)		Life span
RBCs    
WBCs    
Platelets    
✓

Answer

ComponentsOriginFunctionApprox. No.
(per mm3)		Life span
RBCsBone marrowCarry O2 to the different parts of body.4*8 million-6.5 million120 days
WBCsBone marrowDevelop immunity.4,500-11,000Two weeks
PlateletsLarge bone marrow cellsInitiate blood clotting.150,000-400,0008-9 days

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