Tag Archives: blood vessels

Blood Circulation: from Greeks to Harvey

Two thousand years ago, the Greeks thought that blood moved backwards and forwards in the blood vessels rather like waves on a beach. They also believed that blood was gradually used up by the body, and that new blood was made from food, water and air. In 1628, William Harvey, an English doctor who worked […]

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Blood as transport system

You have probably seen blood in a film or filmstrip about blood, or even some fresh blood. But have you ever seen some preserved blood on a microscope slide? Blood is a liquid with some small solid objects in it. The red blood cells carry oxygen. The white blood cells help the body to fight […]

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Your heart is the best pump

We shall start with a couple of questions. Why do we have a heart? What does it do? What’s the pulse? There are blood vessels all over the body. Some are easy to see, because they are close to the skin surface. Most blood vessels cannot be seen because they are buried deep among the […]

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