The body requires a constant supply of blood, which is pumped around the body via the heart through a closed system consisting of arteries, veins and capillaries. When this system is damaged (internal/external bleeding) and not controlled, clinical shock can result which can be life-threatening.

Click the first topic in the lesson list below. When you have completed each topic, click the yellow 'Next' button. Once you have completed all topics, you must take the 'Quiz' before moving onto the next lesson.