Explorers of the Human Body: SJ & DBSK (Episode 9: Part 1/3)



Exploring the Human Body

The Circulatory System

At the center of the human body — and your circulatory system in particular — is the heart, the fist-sized pump that pushes blood to all of your other body systems. The function of the circulatory system is to deliver oxygen and nutrients to your body and remove carbon dioxide and waste products through a system of veins, arteries, and smaller blood vessels. There are 20 major arteries, including the carotid arteries (in the neck), the axillary artery (in the arm), femoral artery (in the thigh), and the coronary arteries that supply blood to the heart. Major veins include the external and internal jugular veins, which bring blood from the brain back to the heart, and the subclavian veins that run down each side of the body. Oxygenated blood is carried out to your body through blood vessels that decrease in size from arteries to arterioles to capillaries. Once the oxygen is used up, the blood returns to the heart through venules (small blood vessels) and veins. All together, these blood vessels extend for 60,000 miles inside your body.






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Date: 06.12.2018, 17:05 / Views: 52475