William Harvey

William Harvey was a very important English doctor.

He lived from 1578 to 1657. He is famous for his work on anatomy and physiology. Anatomy is the study of how body parts are put together. Physiology is the study of how those parts work. Harvey was the first person to describe blood circulation in great detail. This means he explained how blood moves through the body. He showed how the heart acts like a pump. It pushes blood to the brain and the rest of the body.

Before him, other writers had shared small pieces of these ideas. However, Harvey was the one who explained the whole system.

Harvey learned how the body works by watching closely. He used a method of looking at how parts relate to each other. He often studied animals to understand human bodies better. When he traveled with King Charles I, he went on hunting trips. These trips gave him access to many deer carcasses. He used these animals to make his big observations. By looking at these bodies, he developed his theories about the heart. He saw how the heart moved blood through a continuous loop. This loop is what we call systemic circulation. He also described pulmonary circulation, which involves the lungs.

William was born in Folkestone, England. His father, Thomas Harvey, was a local leader and mayor. William was the oldest of nine children. He went to the King's School in Canterbury for five years. Later, he went to Cambridge University in 1593. He graduated with a Bachelor of Arts in 1597. Then, he traveled to Italy to study even more. He entered the University of Padua in 1599. He became a Doctor of Medicine there in 1602. He was only 24 years old when he graduated. His teachers were very impressed by his memory and skill.

Harvey had a very busy and successful career. He joined the Royal College of Physicians in 1604. He also worked at St Bartholomew's Hospital for most of his life. In 1615, he became a Lumleian lecturer. This job meant he gave talks to teach anatomy to others. He was even the Physician Extraordinary to King James I. In 1628, he published his famous book, *De Motu Cordis*. This book explained the movement of the heart. Some other doctors did not like his new ideas. Because of this, his medical practice fell quite a bit. Still, he remained a respected leader in his field.

Harvey was a man who looked for real proof. He was a skeptic when people talked about magic. In 1634, he helped examine four women accused of witchcraft. Because of his careful reports, the women were found innocent. He once even investigated a woman by looking at a toad. He showed the animal was just a normal creature. He also stayed a doctor during the English Civil War. He even protected the King's children during a battle. Even when things were loud and scary, he stayed focused. He loved to read and learn until the very end of his life.