This diagram covers First Line Defence Mechanisms within Human Defense Systems - Non-specific for GCSE Biology. Physical and chemical barriers, white blood cell responses, inflammatory response It is section 6 of 16 in this topic. Focus on the labels, the relationships between parts, and the explanation that turns the diagram into an exam-ready answer.
First Line Defence Mechanisms
Practice questions for Human Defense Systems - Non-specific
Which part of the body acts as the main physical barrier to prevent pathogens entering?
Explain how mucus and cilia in the airways protect against pathogens.
Quick recall flashcards
What is phagocytosis?
The process by which white blood cells (phagocytes) engulf and digest pathogens or foreign particles.
What is sebum?
An oily substance produced by sebaceous glands in the skin that creates an acidic environment on the skin surface, inhibiting bacterial and fungal growth.