1 When do you need to use your knowledge about______ ______? When someone suddenly ____________or has an accident. 2 What is the ______? It is an organ which acts as a ________ against disease, poisons and the sun’s harmful ____________. 3 What are the functions of the skin described as ________ ? It keeps you warm or cool; it prevents your body from losing too much water and provides you with your ______________ of touch.

Complete the sentences with new words or phrases from the unit.

first aid

skin

complex

sense

falls ill

barrier

rays