Ber-boom, ber-boom, ber-boom…your superhero heart beats more than once every second, whatever you’re doing. Your lungs pull in up to 550 litres of oxygen a day. So how are they linked and just what do they do? Join the Stickmen on a voyage of exploration to find out. • See inside the heart’s pumping chamber • Travel along big arteries and peek inside capillaries • Witness burly white cells fight off bugs You’ll discover why you need 25 trillion red blood cells, how exercise affects the body, and that the lungs could cover a badminton court… Colourful, cutaway artworks and clear, fact-filled text reveal the clever, hidden workings of your breathing and blood circulation, always busy keeping you fit, warm – and alive!