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Circulatory System. Physical Science 9/16/2011. Inside the Heart. The right side of the heart gets oxygen-poor blood (blue arrows) from the body & pumps it to the lungs, where it picks up oxygen.
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Circulatory System Physical Science 9/16/2011
Inside the Heart • The right side of the heart gets oxygen-poor blood (blue arrows) from the body & pumps it to the lungs, where it picks up oxygen. • The left side of the heart gets oxygen-rich blood (red arrows) from the lungs and pumps it to the body cells. • The valves between the atria and ventricles only open in one direction. • Which way does blood flow between an atrium and a ventricle?
Heartbeats • Your heart has two sides, each of which has an atrium and a ventricle. • Each atrium is an area where blood first enters the heart before being sent to body parts. • Each ventricle works to pump blood out of the heart. Blood always comes in an atrium and leaves thru a ventricle. • During a heartbeat, both atria contract at the same time, then relax. Then both ventricles contract at the same time, then relax.
Arteries • Blood vessels that carry blood away from the heart, to the lungs or to the body. • In our traffic analogy, what kinds of roads are most similar to arteries?
Veins • Blood vessels that transport blood back to the heart from the lungs or body.
Capillaries • Smallest blood vessels that form an extensive network in the organs, connecting arteries to veins. • In our traffic analogy, what kinds of roads are most similar to capillaries?
Heartbeats Revisited • During a heartbeat, both atria contract at the same time, then relax. Then both ventricles contract at the same time, then relax. • When chambers of your heart contract and relax, what effect does this have on your blood?
Review… • Oxygen-poor blood comes into the __________ (atrium/ventricle), flows through a valve into the __________ (ventricle/atrium), then flows out through a(n) __________ (artery/vein) to the lungs. • Oxygen-rich blood flows through the same order on the other side of the heart, then flows out to the body cells, transporting oxygen and nutrients.
Section 3-1 CYU(on a separate sheet to TURN IN) • Diagram the pathway of blood thru the human heart. • Compare the three types of blood vessels (arteries, veins, and capillaries). • Fish have gills lined with capillaries. Water contains dissolved oxygen. Explain what you think happens when water flows over the blood supply in fish gills. • Going back to our traffic map analogy, which streets are like capillaries?