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SCIENCLY2U
Circulatory system
Circulatory System:: It carries materials to and from cells throughout the body.
1280 AD Syrian Doctor Ibn an Nafis shows that blood circulation the body.
1628 AD English doctor William Harvey was the first person to show blood circulates in one direction.
Aorta: the main artery of the body, supplying oxygenated blood to the circulatory system. In humans it passes over the heart from the left ventricle and runs down in front of the backbone.
Arteries:: Strong vessels that carry blood away from the heart to the bodyto the body
Veins: the vessels carrying blood to the heart (with valves)
Pulmonary Artery: the artery carrying blood from the right ventricle of the heart to the lungs for oxygenation.
Capillaries: any of the fine branching blood vessels that form a network between the arterioles and venules.
Vena Cava: a large vein carrying deoxygenated blood into the heart. There are two in humans, the inferior vena cava(carrying blood from the lower body) and the superior vena cava(carrying blood from the head, arms, and upper body).
Hemoglobin: a purple-red chemical in red blood cells that is responsible for carrying oxygen.
The heart pumps about 8000 pounds of blood a day!
Galen's theory: some of your blood seeps through invisible pores in the heart to the other side of the heart. Some blood flows into lungs and gives off vapors. Air from lungs flows through vessels into the heart.
In 1280, Syrian doctor, Ib an Nafis shows that blood circulates the body. No one listened to him for 400 years!
In 1628, English doctor William Harvey was the first person to show blood circulates in one direction.
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