Circulatory System Main Structure • Blood o • Transports nutrients, wastes, O2 and CO2 and hormones Heart Right pumps deoxygenated blood to the lungs o Left pumps oxygenated blood to all other organs and tissues o • System of blood (whole slide source 4) • Four Chambers/ Two Pumps right side: right atrium and right ventricle pumps deoxygenated blood to capillary beds in the lungs (pulmonary circuit) left side: left atrium and left ventricle accepts oxygenated blood that will be pumped to rest of the body (systemic (whole slide source 1) circuit) • Blood • • • • Keeps conditions tolerable for enzymes Speed slows down in capillary beds (4) Transports O2 , nutrients and other solutes to cells Carries away CO2 , metabolic waste, and secretions (2) Components of Blood • Plasma o o • o Red blood cells o • • 50-60% of total volume Mostly water, serves as transport medium What everything is dissolved in o Contains hemoglobin and carry away CO2 waste O2 gives it its color White Blood Cells o Some engulf damaged/dead/foreign cells Platelets o (whole slide source 4) Responsible for blood clotting Arteries • • • large diameter thick walls to sustain high pressure (4) carries both oxygenated and deoxygenated out of the heart (3) Capillaries • • • • • Diffusion zones Between 10 and 40 billion capillaries in body Large surface area for gas exchange Close to cells o short distance means fast diffusion for O2 and CO2 Red blood cells go single file through o o capillaries are 3-7 micrometers squeeze puts red blood cells and substances dissolved in plasma in direct contact with the exchange (whole slide sourcearea 4) Veins • • • large diameter no blood pressure pushes blood along with muscular contraction (4) http://resources.fadavis.com/gylyssystems6/Animations/animations.cfm?exercis e=CO2O2&title=Carbon%20Dioxide/Oxygen %20Transport watch parts 3, 6, 10, 11, and 17 References 1. "Heart Anatomy." Anatomy of the Heart. Texas Heart Institute, n.d. Web. 6 Nov. 2012. <http://www.texasheart.org/HIC/Anatomy/anatomy2.cfm>. 2."Circulatory System: The Circle of Blood." The Human. Franklin Institute, n.d. Web. 6 Nov. 2012. <http://www.fi.edu/learn/heart/systems/circulation.html>. 3."Heart and Circulatory System." Kids Health for Parents. Nemours, n.d. Web. 6 Nov. 2012. <http://kidshealth.org/parent/general/body_basics/heart.html>. 4. Starr, Cecie, and Ralph Taggart. Biology: The Unity and Diversity of Life. N.p.: Brooks/Cole, 2001. Print.