1.a. “Epithelial cells play a critical role in protecting against infection.” Discuss this statement using examples of how they do this. (12 points)
1.b. Macrophages play a critical role in the immune response. Discuss how they contribute to the immune response in infection. (18 marks)
Arial font (10 pt) and margins of 2.5 cm on all sides of an A4 page with an extra page allowed for any diagrams.
Do not include the question text in the answer.