Circulatory System

No. Red Blood Corpuscles       
1. Haemoglobin is contained in Red blood corpuscles(RBCs).
2. The life time of RBCs is 120 days.
3. RBCs are produced in bone marrow.
4. 54 lakhs RBCs are present per qubic mm of blood.
5. Oxygen carrying protein called haemoglobin is absent in the blood of insects. Hence blood of insects is white in colour.