Biology·Organisation & maintenance · NSSCO 3.8.3
Defence against disease
Narrated lesson · press play
How your body fights off germs — the barriers that keep them out, the white cells that destroy them, and how immunity, vaccination and a mother's milk protect you.
What you'll learn in this lesson
By the end you should be able to (NSSCO Biology 3.8.3):
- Define pathogen, and state the body's defence mechanisms (barriers, phagocytosis, antibodies)
- Define active immunity and the role of memory cells
- Explain the role of vaccination in controlling disease
- Define passive immunity and explain its importance for breast-fed infants
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Miss Rachel and Mike talk through the whole topic — with the figure and working drawn live.