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PART - 2 - Unit V : CH - 15 Body Fluids and Circulation — BIOLOGY STD 11 Science — Question

Rajasthan BoardEnglish MediumSTD 11 ScienceBIOLOGYPART - 2 - Unit V : CH - 15 Body Fluids and Circulation3 Marks
Question
What is lymph? Write down four differences between $T$ cells and $B$ cells.
✓

Answer

Lymph : Lymph is the fluid that does not reach every part and organ of the body through blood cells. It only reaches the interstitial spaces between tissue cells by oozing through the walls of capillaries made of endothelium (which is formed from the endothelium layer), consisting mainly of plasma and white blood cells, leaving behind red blood cells. This leaked fluid is called lymph.
Differences between T-cells and B-cells
S.No.T-cellsT-cells
1. T-cells mature in the thymus gland. B-cells mature in lymphoid organs like tonsils.
2. They recognise and eliminate infected cells. They recognise antigens using receptors on their
3. They directly attack. They produce a large number of antibodies for defense.
4. Their lifespan is around 3-4 years. Antibodies remain alive for only a short period.

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