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Topic 6.2.1 – 6.2.7 The Transport System Page 210 - 216

Topic 6.2.1 – 6.2.7 The Transport System Page 210 - 216. What will we learn? -How the heart works -Evolution of the heart -Structure/function of blood vessels -Structure of blood. “Formed elements” include: Red Blood Cells White Blood Cells Platelets.

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Topic 6.2.1 – 6.2.7 The Transport System Page 210 - 216

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  1. Topic 6.2.1 – 6.2.7 The Transport System Page 210 - 216

  2. What will we learn? -How the heart works -Evolution of the heart -Structure/function of blood vessels -Structure of blood

  3. “Formed elements” include: Red Blood Cells White Blood Cells Platelets Blood is made of plasma and “formed elements” 45% Cells / 55% Plasma

  4. Oxygen and Carbon Dioxide Nutrients from the Digestive System Salts and Minerals Hormones What does blood circulate? Water Proteins: Antibodies & Clotting Factors Heat Wastes

  5. Red Blood Cells (erythrocytes) White Blood Cells (leucocytes) The 3 types of formed elements Platelets (thrombocytes)

  6. Carry O2 or CO2 • Are anucleate • Live only 120 days • 4.5 to 5.5 million / mm3 Red Blood Cells • Made in bone marrow • Are “biconcave” discs

  7. MONOCYTES -- phagocytic NEUTROPHILS -- phagocytic, most common EOSINOPHILS -- respond to hookworm? B Lymphocytes -- produce antibodies WBC Types: T Lymphocytes (Killer/Helper/Memory) --destroy invaders BASOPHILS -- produce histamines

  8. Circulatory System http://www.youtube.com/watch?v=D3ZDJgFDdk0

  9. The development of the heart Evolution of the Heart http://www.mhhe.com/biosci/genbio/biolink/j_explorations/jhbch05.htm

  10. Controlling the Heart Heart muscle tissue is made of myogenic (self-stimulating) muscle. Once cell’s contraction stimulates its neighbour. The first impulse is sent from the SA node, to the AV node, which sends the signal through the purkinjefibres.

  11. There is a nerve connecting brain to heart that will speed up the heart rate There is a 2nd nerve connecting brain to heart that will slow down the heart rate What Controls the Heart Rate? The hormone ADRENALIN will also speed up the heart rate

  12. Why does the left ventricle have the thickest walls? Because it pumps blood to the entire body! Why does the right ventricle have the next thickest walls? Because it pumps blood only to the lungs and back! Why Does Wall Thickness Vary? Why do the atria have the thinnest walls? Because they pump blood only down to the ventricles

  13. Vein Artery The Types of Blood Vessels Venule Arteriole Capillary

  14. Summary of Differences

  15. This happens when veins weaken and expand. The flaps of the valve cannot touch. Valves stop working and blood pools in the vein. Varicose Veins

  16. Homework: Page 216 # 1-4

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