Circulatory System
Circulatory System job The main role of the circulatory system is to bring oxygen, nutrients such as sugar to the cells and remove waste products such as carbon dioxide. Multicellular organisms , or living things made of many cells need a system to deliver oxygen and food and remove wastes in order to survive.
The Heart
The job of the heart The main task of the human heart is to pump the blood. Unoxygenated blood will get pumped to the lungs to get oxygen and drop off carbon dioxide waste. Oxygenated blood get pumped to the entire body. Unoxygenated blood returns to the heart to get pumped to the lungs to get more oxygen.
Heart Parts and their jobs Right atrium received unoxygenated blood from the body. Right ventricle pumps unoxygenated blood to the lungs to get more oxygen. Pulmonary artery- brings oxygenated blood from the lungs to the left atrium. Left Atrium- received oxygenated blood from the lungs. Left ventricle- pumps oxygenated blood out to the body cells Aorta- is the largest artery in the body which carries oxygenated blood to the body.
The Blood Vessels There are 3 types of blood vessels which all function to transport blood throughout the body. Veins Arteries Capillaries
Jobs of each blood vessel Artery- most arteries carry oxygenated blood FROM the heart. The exception is the pulmonary artery which carries unoxygenated blood to the lungs. Veins- most veins carry unoxygenated blood to the heart as well as the waste product carbon dioxide. The exception is the pulmonary vein, which carries oxygenated blood from the lungs to the heart Capillaries- are the tiny blood vessels where the delivery of food and oxygen take place. These blood vessels serve every single cell in the body!
Capillaries (continued) Capillaries are on 1/100th of a millimeter in diameter- a bit larger than your average red blood cell. Capillaries are so small that blood cells have to go “single file” to get through. Capillaries touch every cell in the body. Gas exchange takes place while a red blood cell slides past a body cell. Oxygen leaves the red blood cell and carbon dioxide gas enter it. The red blood cell then takes that carbon dioxide gas to the lungs to be exhaled.
The Blood The blood is made of 4 different things all which work to keep a body healthy.
Red Blood Cells
Red Blood Cells (RBC) The contain the protein hemoglobin which grabs onto oxygen. Red blood cells get oxygen from the lungs, deliver it to the cells and picks up carbon dioxide gas to bring back to the lungs to be exhaled.
White Blood Cells
White Blood Cells There are many types of white blood cells in human blood. The main job of white blood cells is to help a body fight germs that might invade the body- they fight disease!
Plasma and platelets
Plasma and Platelets Platelets are the cells in blood that cause your blood to clot. It is what helps create scabs. Plasma is the straw color fluid in blood that is the liquid part of the blood. It contains dissolved stuff like sugars and other nutrients, it also contains water.