Physical and Chemical Barriers to infection by microorganisms. GCSE 9-1 Edexcel 5.12

This lesson consists of a PowerPoint presentation, facts sheets, a code breaker and a printable table.

It has been written for Edexcel:

5.12 Describe how the physical barriers and chemical defences of the
human body provide protection from pathogens, including:
a physical barriers, including mucus, cilia and skin
b chemical defence, including lysozymes and hydrochloric
acid.
With one final slide to briefly cover:
Explain how sexually transmitted infections (STIs) are spread
and how this spread can be reduced or prevented, including:
a Chlamydia (bacteria)
b HIV (virus)

The lesson consists of a code breaker starter followed by a definition of key terms activity. Delete as many of the clues on the codebreaker as you want to, you can therefore choose how difficult it is. A slide that introduces the idea that everyone is at risk of infection by pathogens and asks how the body defends against such an attack. Students are then given a table to complete with information on fact cards. There are questions to complete the lesson.