Describe how the physical defences of human body prevent the invasion of microooragnisms which cause infections.

Our skin surrounds almost all parts of our body and can act as a mechanical barrier between microorganisms and our body. If the skin is damaged or cut, a scab will be formed to prevent microorganisms from entering into our body to cause an infection.Apart from the skin, other parts of our body also have physical defences to prevent infection. For example, our eyes can produce tears which contain enzymes to break down bacterial cell wall. Our trachea are lined with mucus-secreting cells which secrete mucus to trap pathogens and are then sweeped up by the beating action of cilia to be coughed or sneezed out.

AT
Answered by Audrey T. Biology tutor

2615 Views

See similar Biology GCSE tutors

Related Biology GCSE answers

All answers ▸

Explain the similarities and differences between plant and animal cells structure and shape (may include use of a diagram and bullet points are accepted).


What are the two main differences between prokaryotic and eukaryotic cells?


Explain the process of inhalation


Explain eutrophication.


We're here to help

contact us iconContact ustelephone icon+44 (0) 203 773 6020
Facebook logoInstagram logoLinkedIn logo

MyTutor is part of the IXL family of brands:

© 2025 by IXL Learning