MODULE 4 THE HUMAN BODY Unit 1 • The human body and its defences • Anatomy and physiology • A complex structure • The immune system • Immunity • The cells of the immune system • Vaccines Unit 2 • Diseases • Disorders of the immune system • Neurodegenerative diseases • More diseases affecting the brain and the nervous system • Cardiovascular diseases • Diabetes Unit 3 • Addictions • Smoking • Alcohol • Drugs • Teens and smartphones: an addiction?