Question

Which of the following is the difference between blood and lymph:
a. Absence of RBC
b. Absence of WBC
c. Number of WBC is less in blood
d. None of the above

Answer 1

Hint: Blood and lymph are two kinds of circulatory fluids of our body. Blood flow in the circulatory system whereas lymph flows in the lymphatic system.

Complete answer:

Lymph is formed by the interstitial fluid collected in the intercellular spaces after fenestration of blood from thin capillary ends. This interstitial fluid is then absorbed into the lymphatic vessels. Large protein molecules and RBCs are unable to enter the lymphatic vessels.
The major difference between the two connective tissue fluids are:-

Blood	Lymph
It is reddish in colour due to the presence of haemoglobin.	It is colourless or slightly white in colour and lacks haemoglobin.
It flows in blood vessels.	It flows in lymphatic vessels.
It consists of plasma, RBC, WBC and platelets.	It consists mainly of WBC and platelets.
It is meant for the exchange of gases like oxygen, carbon dioxide, etc., nutrients, hormones, waste products, etc.	Its primary role is in the defense mechanism of our body.
It is reached in proteins like albumin, globulin, etc., minerals and enzymes.	Lymph plasma lacks large protein molecules and minerals.
Its movement is fast and bidirectional.	Its movement is slow and unidirectional (towards the heart).

So, the correct answer is ‘Absence of RBC’.
Note: Number of WBCs is comparatively lesser in the lymph. It consists mainly of lymphocytes meant for defence mechanisms. It carries dead and decaying wastes, toxins and pathogens to lymph nodes for their destruction.