Download - Sub 1[1].4 form 5
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BIOLOGY FORM 5
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LEARNING OUTCOMES1. Explain how the lymphatic system
complements the circulatory system;2. Compare the content of blood,
interstitial fluid & lymph;3. Predict what will happen if interstitial
fluid fails to return to the circulatory system;
4. Conceptualise the relationship between the lymphatic system & circulatory system.
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THE LYMPHATIC SYSTEM COMPLEMENT THE CIRCULATORY SYSTEM
• 10% of interstitial fluid drains into the lymphatic capillaries forming lymph.
• Move due to the contraction & relaxation of skeletal muscles backflow is prevented by semilunar valves.
• Lymph in the right lymphatic duct & the thoracic duct flows into the right & left subclavian veins of the BCS, respectively.
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COMPARE THE CONTENT OF BLOOD, INTERSTITIAL FLUID
& LYMPH
BLOOD INTERSTITIAL FLUID
LYMPH
SIMILARITIES
• Watery liquid•Transport gases, nutrients &
waste products.
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COMPARE THE CONTENT OF BLOOD, INTERSTITIAL FLUID &
LYMPHBLOOD INTERSTITIAL
FLUIDLYMPH
DIFFERENCESInside blood vessel In the intercellular
spacesInside the lymphatic
vessels
More protein than interstitial fluid &
lymph
Less protein than blood & lymph
More protein than interstitial fluid but less
than blood
Oxygenated Oxygenated Deoxygenated
Erythrocytes, leucocytes & platelets
present
Only leucocytes present
Only leucocytes present
Low lipid content Low lipid content High lipid content
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If Interstitial Fluid Fails to Return to th Circulatory
System•It accumulates in the organs &
tissues the organs & tissues swell up oedema.
•Interstitial fluid should return to the CS at the same rate as it is produced.
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THE RELATIONSHIP BETWEEN LYMPHATIC SYSTEM & BLOOD
CIRCULATORY SYSTEM
• LS & BCS transport interstitial fluid back to the heart.
• The LS joins the BCS when the right lymphatic duct opens into the right subclavian vein & the thoracic duct opens into the left subclavian veins.
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