BLOOD
PLASMA · RBC · WBC · PLATELETS
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What is in Blood?
Plasma
55%
WBC +
platelets
RBC 45%
RBC
Haemoglobin: carries oxygen
WBC
Fight germs · immunity
Platelets
Form clots at a wound
55%
plasma (liquid)
45%
cells
~5 L
of blood in an adult
1. Plasma
90% water + proteins, glucose, salts
The liquid part of blood
2. How many? (per mm³)
RBC ~50 lakh · WBC 4000–11000
Platelets 1.5–4 lakh
3. Remember
An RBC lives about 120 days
Made in the bone marrow
MATRIC BIOLOGY · TRANSPORT · PUNJAB BOARDS
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