Diagram showing course of the arteries'. Wills' cigarette card, 1915.

UNITED KINGDOM - SEPTEMBER 20: Diagram showing course of the arteries'. Wills' cigarette card, 1915. Number 35 in a series of 50 'First Aid' cigarette cards issued by Wills. The arterial system carries oxygenated blood from the heart out to the extremities of the body under pressure. From the upper end of the heart, the aorta forms an arch from which arteries lead to the head and neck and upper limbs. The lower part of the aorta passes from the heart down through the chest and abdomen, where it divides just below the navel into the two femoral arteries serving the lower limbs. The arrows in the diagram show where pressure may be applied to arrest arterial bleeding from any point beyond them. (Photo by Science & Society Picture Library/SSPL/Getty Images)