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This page lists the main function of your circulatory system and gives navigation so you can learn more



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Our Circulatory System and Its Functions


The Main Function


Your circulatory system consists of two parts: the systemic circulation, which circulates blood throughout the entire body (except for the lungs) and the pulmonary circulation, which carries the blood to and from the lungs.The function of our circulatory system is to transport oxygen and nutrients to organs and tissues throughout the body and carry away waste products. In short, to get stuff where it needs to go. Your circulatory system also helps to keep your temperature at a normal 98.6 degrees Fahrenheit. When you are hot, capillaries just beneath your skin grow slightly wider to allow more blood to be near the surface of your skin and allow some body heat to escape, causing your face to become red when you excercise or grow hot. When you are cold, the opposite happens and the capillaries contract slightly allowing less heat to escape.

Open/Closed Circulatory Systems and How They Work


  • Open - An open circulatory system is present in some invertabrates like molluscs and arthropods where blood and fluids are not distinctive. Movements like locamotion moves the blood around the body and when the heart relaxes then the blood returns to the heart.
  • Closed - This is made up of blood, blood vessles,and the heart.This is present in all vertebrates including earthworms. Arteries carry oxygenated blood to the tissue and veins bring deoxygenated blood to the heart. Blood passes through the arteries to the viens through the capillairies. We have a closed circulatory system.
  • None - animals like flat worms have no circulatory system, so the nutrients go straight to the muscles from the digestive tract. ----

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