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A series of free Science Lessons for 7th Grade and 8th Grade, KS3 and Checkpoint Science in preparation for GCSE and IGCSE Science.

Blood has four main components:
1. Plasma
- Fluid part of blood
- Carries carbon dioxide, hormones and waste

2. Red blood cells
- Contain haemoglobin which carries oxygen
- Made in the bone marrow

3. White blood cells
- produce antibodies and destroy harmful microorganisms
- Made in the bone marrow

4. Platelets
Clump together to form clots
Protect the body by stopping bleeding

Blood under the Microscope
Red blood cells and white blood cells

Immune Cells Eating Bacteria (Phagocytosis)

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