Solve this:
Q.1. Name the two fluids that circulate in the body.
Q.2. In the diagrams we conventionally show veins in blue. What is the actual colour of the blood flowing through the following ?
(i) In arteries (ii) In veins (iii) In capillaries
Q.3. In a coloured diagram why do we generally show the pulmonary artery in blue and pulmonary vein in red colour ?
Q.4. Name any four substances transported by blood.
 

Dear student ,

1. Blood and lymph circulate in the body.

2. In textbooks,  the pulmonary vein is blue and pulmonary artery is red in colour. This is done to distinguish between the deoxygenated and oxygenated blood. 
Blood in veins is actually dark red (it only appears blue) in colour because it contains deoxygenated blood. It may appear blue under the skin due to refraction and involvement of other factors. When oxygen binds to haemoglobin it then achieves bright red colour. In the absence of oxygen, it is dark red in colour. 
  
In summary, arteries are bright red, veins are dark red in colour. The colour of blood in capillaries changes/varies due to the presence of both oxygenated and deoxygenated blood.

3. 
In textbooks,  the pulmonary vein is blue and pulmonary artery is red in colour. This is done to distinguish between the deoxygenated and oxygenated blood. 
Blood in veins is actually dark red (it only appears blue) in colour because it contains deoxygenated blood. It may appear blue under the skin due to refraction and involvement of other factors. When oxygen binds to haemoglobin it then achieves bright red colour. In the absence of oxygen, it is dark red in colour. 
  

4. Blood plasma helps in transporting of different blood cells (RBCs, WBCs and platelets),  proteins (fibrinogen, albumins and globulins), nutrients ( such as  glucose, amino acids,  mineral salts, vitamins, lipids, etc )  and hormones  to the body cells.  
 
Hope this information will clear your doubts about topic.

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Regards


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