Question

Given alongside is a diagram of a smear of human blood. Study the same and answer the questions that follow:

1. Name the parts l, 2, 3 and 4 indicated by guidelines.
2. Mention two structural differences between the parts labelled 'l' and '2'.
3. What is the main function of the parts labelled 1, 2 and 3 respectively?
4. What is the life span of the part labelled '1'?
5. Name a soluble protein found in '4' which helps in the clotting of blood.

Answer 1

1.    
   1. RBC's (Erythrocytes)
   2. WBC (Platelets)
   3. Blood Platelet
   4. Plasma
2. RBCs are biconcave and disc-like, while WBCs have an irregular amoeboid shape. 
   RBCs are smaller in size and devoid of nuclei. Meanwhile, WBCs are larger and have a nucleus.
3. Functions of:
   
   1. RBCs (erythrocytes): It contains haemoglobin pigment, which helps transport oxygen.
   2. WBC (Platelets): WBCs protect the body against infections, thus making them called soldiers of the body.
   3. Blood Platelet: Blood platelets are the initiators of blood clotting.
4. The average life of RBC is about 120 days.
5. Fibrinogen.