Immunity

An image of a twisting double-helix.

Adaptive immunity is a system of highly complex, specialised and specific responses to an invading pathogen. It is the last line of defence against invading pathogens.

Although most pathogens are prevented and destroyed by the innate immune system, sometimes these defences are not strong enough. If this is the case, the adaptive immune system takes over.

This system involves:

  • The lymphatic system
  • The adaptive immune response
  • Passive and active immunity

This resource revises immunity and within immunity there are 3 key concepts:

To determine if this resource will benefit you, start by answering the following questions.

  • What is the lymphatic system, its role, and the cells and organs that make it up?
  • What are the pathways in the cell-mediated and humoral immune responses, and how do antibodies function as part of the adaptive immune response?
  • How can immunity be presented graphically, and what are the different ways in which immunity can be gained?

The answers to these questions are provided on the following pages. Use this resource to refresh your memory, reinforce your understanding of these concepts, and prepare more effectively for university-level learning.