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The circulatory system

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An 8th grade lesson introductory lesson on the circulatory system ... in addition to the powerpoint I had the students take their pulse at rest at the beginning of class and then again during the middle of class after having them run in place for 30 seconds

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The circulatory system

  1. 1. The Circulatory System
  2. 2. The Learning Objectives• Define the parts of the circulatory system and what they do• Point out the four chambers of the heart and what they do• Compare arteries, capillaries, and veins
  3. 3. Before We Get Into The Heart of the Lesson
  4. 4. The Cold Heart Facts- The heart is a muscle- The heart is a little larger than your clenched fist- Your heart beats about 100,000 times in one day and about35 million times in a year. During an average lifetime, thehuman heart will beat more than 2.5 billion times.- Give a tennis ball a good, hard squeeze. Youre using about thesame amount of force your heart uses to pump blood out to thebody. Even at rest, the muscles of the heart work hard—twice ashard as the leg muscles of a person sprinting
  5. 5. - The heart pumps about 1 million barrels of blood duringan average lifetime—thats enough to fill more than 3 supertankers
  6. 6. The Definition The bodily system consisting of the heart, blood vessels, and blood that circulates blood throughout the body, delivers nutrients and other essential materials to cells, and removes waste products - - Also called the cardiovascular system.
  7. 7. The Circulatory SystemWhat it consists of: - Heart - Blood Vessels - BloodWhat it does: - Circulates blood throughout the body - Delivers nutrients to cells - Removes waste products from cells
  8. 8. The Heart A hollow muscular organ that pumps the blood through the circulatory system by rhythmic contraction and dilation.
  9. 9. The Four Chambers Of The Heart
  10. 10. Left Atrium: Takes oxygen-rich blood from thelungs and pumps it into the left ventricleLeft Ventricle: Pumps the oxygen-rich bloodthrough the aorta which sends it out into the bodyRight Atrium: Takes the used blood from the bodythat no longer has oxygen and pumps it into theright ventricleRight Ventricle: Pumps the oxygen-less blood intothe lungs where it picks up oxygen again
  11. 11. Blood Vessels- The part of the circulatory system that transportsblood throughout the body.
  12. 12. Three Types of Blood Vessels1) Arteries: carry oxygen-rich blood away from theheart2) Veins: carry blood containing waste productsto different organs (kidneys, liver, etc.) and thenback to the heart3) Capillaries: enable the actual exchange of water andchemicals between the blood and the tissues – forexample…diffusion of oxygen within the lungs
  13. 13. The Four Chambers Of The Heart
  14. 14. The Aorta The largest artery in the body, originating from the left ventricle of the heart and extending down to the abdomen, where it branches off into two smaller arteries. The aorta distributes oxygenated blood to all parts of the body.
  15. 15. BloodThe fluid that circulates in the heart, arteries, capillaries, andveins of a vertebrate animal carrying nourishment and oxygento and bringing away waste products from all parts of the body.
  16. 16. The Bloody TruthBlood consists of: - Red blood cells: disk shaped cells that carry oxygen to cells and carbon dioxide out - White blood cells: cells that engulf and digest bacteria and fungi; an important part of the bodys defense system - Plasma: straw-colored liquid component of blood. It is mostly water (93% by volume) and contains dissolved proteins, glucose, clotting factors, mineral ions, hormones and carbon dioxide
  17. 17. Blood’s Role in the Digestive Process
  18. 18. Blood and Breathing
  19. 19. HomeworkOption 1) Write an essay that details a day in the life ofa red blood cell as it travels through the circulatorysystem … where did you go and what happenedOption 2) Draw the circulatory system and point outthe three different types of blood vessels, the heart andits chambers, the lungs, and red blood cells.

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