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The 3 main parts of The Circulatory system The Heart The Blood Vessels Blood Parts of The Heart The Atria -Receiving Chambers The Ventricles -Pumping Chambers The Valves -Controls Flow The Septum -Divides the Heart Types of Blood Vessels Arteries -Carry blood away from the Heart -The Aorta is the largest artery Veins -Carry blood away from the Heart -Veins contain valves -The Vena Cava is the largest vein Capillaries -Known as the “Distribution Pipes” The Composition of Blood The Plasma (Fluid) makes up 55% of the blood volume. Blood Composition 60 50 The Solids (Cells) make up 45% of the blood volume. 40 30 20 10 0 Plasma Solids Blood Plasma 97% Water Other 3% -Antibodies and Proteins - Nutrients and Wastes Blood Solids Red Blood Cells -Carry oxygen -Contain Hemoglobin White Blood Cells -Attack bacteria & other invaders Platelets -Control the blood clotting process Credits Graphics courtesy of Crystalcafe.com & The Franklin Institute online. Presentation by Steve Kennette Thanks to: Spartanburg School District #5 Duncan, S. C.