The Figure shows some cells in a sample of human blood, seen using a light microscope.
Figure

Name cell P.
Name the liquid part of the blood that carries these cells.
Give the function of S.
Cell Q is a phagocyte.
Describe how a phagocyte protects the body against pathogens.
42 exam-style questions on Edexcel GCSE Biology 8.2 Blood and circulation, covering 8.2.1 Structure and function of the blood, 8.2.2 Structure of blood vessels, 8.2.3 Structure of the heart and circulatory system, and 8.2.4 Cardiac output. Each one has a worked solution and a mark scheme showing where the marks go.