Powerpoint lecture covering the following in a modern, concise format:

Specification Point 2.63B - Understand how vaccination results in the manufacture of memory cells, which enable future antibody production to the pathogen to occur sooner, faster and in greater quantity.

Specification Point 2.64B - Understand how platelets are involved in blood clotting, which prevents blood loss and the entry of micro-organisms

Complete set of Chapter 3 Lectures are available.