(a)(i)Name the fluid labelled P, Q and R
(ii)State two differences between the fluid P and the fluid R
(b)(i)State the main function of fluid Q.
(ii)Predict what would happen if the fluid Q fails to return to the circulatory system
(iii)Describe briefly how fluid Q is returned to the blood circulatory system.[3m]
(c)State two main functions of the lymphatic system.
Suggested Answer:
(a)(i) P : Blood
Q: Interstitial fluid/tissue fluid
R : Lymph
(ii) This results in genetic and morphological diversity
P/Blood while R/Lymph
Contains erythrocytes and platelets// Does not contain erythrocytes and platelets
Contains more protein // Contains less protein
Has low lipid content // Has high lipid content
Red in colour // Yellow in colour / milky
(b)(i) To supply nutrients and oxygen to body cells/ and to receive
excretory products from body cells
(ii) Swelling/oedema occurs
(iii) 1. 90% of Q/the tissue fluid/interstitial fluid re-enters the
capillaries at the venule end of the network
2. 10% diffuses into lymph capillaries
3. Lymph vessels carry fluids to the subclavian vein
(c)1. Takes up excess interstitial fluid and returns it to the blood
circulatory system
2. Helps to defend the body against pathogens.
3. To carry fat molecules from the digestive system
4. To connect and coordinates with the blood circulatory system
5. To enhance body immunity
6. To produce and balance the electrolyte in interstitial fluid
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