Phagocytosis: YouTube video with annotation task and pdf summary sheet

This YouTube video comes with

1. a pdf summary of the video
2. an unannotated version of the summary sheet that students can fill in using the video. This sheet has only the pictures from the video.
3. an unannotated version with scaffolding

Phagocytes have evolved over millions of years to be able to recognise common features of pathogens. They carry various receptors on their surface for this purpose. They are part of the first stages of a response to infection. This is described as innate immunity because it is not learned through exposure during a single lifetime. It is described as part of the cellular immune response to to distinguish it from an antibody response. However, antibodies enhance phagocytosis. Phagocytosis by macrophages also plays a key role in the initiation of an antibody response because macrophages can present antigens to helper T cells. Macrophages also release cytokines that stimulate antibody responses.