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Circulatory System

Circulatory System. Honors Biology Powerpoint #4 Unit 8 – Chapter 37. Circulatory System. Circulatory System. Structures : Heart, Blood vessels, blood Functions : Brings O2 , nutrients and hormones to cells, takes away CO2 and waste F ights infection

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Circulatory System

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  1. Circulatory System Honors Biology Powerpoint #4 Unit 8 – Chapter 37

  2. Circulatory System

  3. Circulatory System • Structures: • Heart, Blood vessels, blood • Functions: • Brings O2, nutrients and hormones to cells, takes away CO2 and waste • Fights infection • Regulates body temperature.

  4. Heart • Made of cardiac muscle • Beats on average 65-85 beats per minute • Pumps to circulate blood throughout the body

  5. Take your heart Rate

  6. Blood Vessels: • Carry blood to cells • Lined with smooth muscle tissue • Three kinds: • Arteries • Capillaries • Veins

  7. Arteries (carries blood away) • Carry oxygenated blood from the heart to the rest of the body. Direction of blood flow

  8. Capillaries • Branch off of the Arteries • The smallest of the blood vessels • some have diameters as small as 1 red blood cell • Takes blood to all cells where diffusion occurs Direction of blood flow

  9. Capillaries

  10. Veins • Takes deoxygenated blood from the capillaries back to the heart Direction of blood flow

  11. Comparing arteries and veins

  12. Why do arteries have thicker and stronger walls?

  13. Veins • Have valves to prevent backflow because not receiving pressure from heart • Muscles help pump blood back to heart through the veins

  14. Current Articles • http://www.livescience.com/44882-ear-reattachment-leeches.html

  15. Varicose veins

  16. Treatment for varicose/spider veins • Sclerotherapy.doctor injects the veins with a solution that scars and closes those veins, causing the blood to reroute through healthier veins. • Vein ligation/vein striping • Laser surgery.Laser surgery works by sending strong bursts of light into the vein that make the vein slowly fade and disappear. No incisions or needles are used. The treatment is often less effective than sclerotherapy.

  17. Blood • The human body has 4-6 liters of blood • Blood: • 45% of blood is Cells • 55% of blood is plasma

  18. Blood Cells: 3 kinds • Red Blood Cells: transports oxygen, contain hemoglobin (gives them color) • White Blood Cells (leukocytes): attack foreign substances or organisms. • Platelets: stick to broken blood vessels to stop bleeding when you are cut

  19. Plasma • 90% water • 10% other materials: • Dissolved gases • Salts • Nutrients • Enzymes • Hormones • Waste products

  20. Upper body Blood Flow in the Heart

  21. The Heart • The human heart has four chambers • Left and right ventricle • Left and right atrium • The left side of the heart pumps oxygenated blood to the body • The right sideof the heart pumps deoxygenated blood to the lungs

  22. https://www.youtube.com/watch?v=BEWjOCVEN7M Left Atrium Right Atrium Right Ventricle Left Ventricle

  23. 1) The right atrium receives deoxygenated blood from the body through the superior and inferior vena cava.

  24. 2) The right atrium pumps blood through the tricuspid (AV) valve and into the right ventricle

  25. 3) Right Ventricle Contracts and pushes blood through pulmonary valve towards lungs

  26. 4) Blood is pushed through the pulmonary arteries to the lungs to receive oxygen

  27. 5) Oxygenated blood returns to the left atrium from the lungs through the pulmonary veins

  28. 6) Blood passes through the bicuspid (mitral) valve into the left ventricle.

  29. 7) Contraction of Left ventricle pumps blood through aortic valve to the aorta

  30. 8)Blood travels through aorta and then to all regions of the body where it feeds cells with oxygen picked up from the lungs and nutrients from the digestive tract.

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