Cambridge (CIE) IGCSE Biology
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(Blood)
Blood Clotting & White Blood Cells
The Body’s Defenders: White Blood Cells & Clotting
Lymphocytes & Phagocytes: Extended
White blood cells (WBCs) are like your body’s tiny defenders. They help protect you from germs and diseases. There are two main “guard types” you should know about:
Phagocytes
- These cells are like hungry “Pac-Men,” gobbling up germs (called pathogens).
- They engulf (surround) and digest these invaders, keeping you safe.
Lymphocytes
- These are like “smart defenders” that produce antibodies—special “locks” that fit germs like keys, making it easier to stop them.
Together: Phagocytes and lymphocytes work as a team to catch, break down, and help remove germs.
What Is Blood Clotting?
- Blood clotting is like your body’s emergency patch kit when you get a cut,
- Platelets, tiny cell fragments help form a “plug” and start a chain reaction that turns fibrinogen into fibrin—like turning liquid glue into a net.
- This net traps cells and forms a scab, stopping bleeding and blocking germs from getting in.
In simple terms:
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Think of phagocytes as “germ-eaters” and lymphocytes as “germ-taggers.”
Platelets are your body’s “emergency repair team,” stopping leaks.
Clotting not only stops bleeding but also helps keep germs out.
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