Essay on The Circulatory System

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The heart (Page: 100) • Beats 60-100 times per minute • When the heart contract, it produces pressure on the blood in the circulatory system which pushes blood through the body. • Valve-flexible flaps of tissue. • These are found in the heart, veins and the rest of the circulatory system. • They open when blood is pushed through them, and then close to prevent blood from flowing backward. • Structure of the heart allows 2 separate paths through which the blood circulates. • First path blood takes is from the right atrium to the right ventricles (pumps the blood trough the pulmonary artery to the lungs. • Blood eliminates and picks up oxygen then goes to the left ventricle, it goes to the aorta (a huge artery), to the rest of the body. • It is an amazing highway that travels through the entire body connecting all your body cells • Gets messages from body that tells it to pump more or less blood depending on a person’s needs. • Lies between the lungs and just to the left of the middle of chest cavity. • The heart is about the size of fist • 3 main things to keep your heart healthy: • Exercise (good for the heart healthy) • Eat healthy food • Don’t smoke

Red Blood cells
There are about 5,000,000 red blood cells in 1 drop of blood.

White Blood cells • Help body fight off germs • Help fight infections

Platelets • Blood cells that help stop bleeding • It’s the blood that leaks when you get an injury. • In order to stop the bleeding, platelets stick to the opening of injury and that why they seal the broken blood vessel.

Capillaries • Tiny blood vessels that connect arteries to veins. • Food, Oxygen and Wastes pass in and out of blood through capillary walls

Arteries • Delivers oxygen-rich blood from heart to tissues in the body • Each artery is a muscular tube and has 3 layers: • Intima – inner layer by endothelium or smooth tissue • Media – layer of musde that lets arteries handle high pressures from the heart. • Adventitia – connective tissue anchoring arteries to nearby tissues

Right Atrium • One of the 4 hollow cambers in the heart • It’s located on the upper right side • Relatively blood from 2 large veins; return blood that is low in oxygen.

Left Atrium • Receives blood returning to heart from pulmonary veins • Extend from left ventricle to the heart and bring oxygen-rich blood back to heart

Mitral Valve • Located
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