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Circulatory System Got heart? It’s Time to Deliver • Carrying food, water, and oxygen • Every cell needs food, water and oxygen to survive • Circulatory system delivers these “goods” • Removing wastes from the cells • Body cells make waste • The wastes must be removed from the cells, or they would build up and prevent the cells from doing their jobs properly. • The circulatory system carries the wastes to other parts of the body where the wastes are then removed from the body. The Little Things Maintaining body temperature • Capillaries – tiny tubes that monitor temperature by going close to the surface of our skin so our heat can be released or retreated into our bodies to hold onto the heat and protect the organs Fighting disease • Circulate wastes through the body Carrying chemicals • Medicine, liquids and other things we ingest are delivered to different parts of the body Parts of the Circulatory System: The Heart Organ – group of cells and tissue working together to do the job of the circulatory system Most important and hardest working organ About the size of your fist Located in the middle of your chest behind your ribs and breastbone Parts of the Heart Comprised of 4 chambers Two upper chambers (atria) Two lower chambers (ventricles) • Right atrium • Left atrium • Right ventricle • Left ventricle Parts of the Heart Valves between the chambers • Think of the valves like doors that only open one way Tricuspid valve • Opens from the right atrium into the right ventricle Pulmonary valve • Opens from the right ventricle letting blood flow into the pulmonary artery leading out of the heart Mitral valve • Opens one way from the left atrium to the left ventricle Aortic valve • Lets blood flow from the left ventricle out of the heart through the aorta Parts of the Heart It is important for the blood on the right side of your heart not to mix with the blood on the left side of your heart. Septum • Thick wall of muscle between the two sides of the heart Diagram of the Heart Two Pumps Cardiac muscle • The muscle in your heart that works to pump your blood One pump moves the blood from the upper chambers, or atria, into the lower chambers The other pump moves the blood out of the heart and into the lungs or body Tubes, Tubes and More Tubes Arteries • • • • Blood vessels that lead blood away from the heart Thick walls but they are very elastic They can expand and contract as the blood is pumped into them and then moves on The arteries nearest your heart are the largest. As they get further and further from the heart, they become smaller and smaller “Arteries go away” Tubes, Tubes and More Tubes Capillaries “capillaries connect” • Tiniest blood vessels in your body • Blood goes through them single file • Connect the arteries with the veins Tubes, Tubes and More Tubes Veins “veins have valves” • Carry blood toward the heart • Thinner walls • All blood flows in one direction Recap Two big jobs Three smaller jobs Three essential parts • Carrying food, water and oxygen • Removing wastes from the cells • Maintaining body temperature • Fighting disease • Carrying chemicals • Arteries • Capillaries • Veins