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The Circulatory System

The Circulatory System. Plan of attack. What is the Circulatory System What does it do Components Blood Blood Vessels Heart Putting it all together . What is the circulatory system?. Network of vessels used as a transportation system in the body with 6 major functions :

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The Circulatory System

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  1. The Circulatory System

  2. Plan of attack • What is the Circulatory System • What does it do • Components • Blood • Blood Vessels • Heart • Putting it all together

  3. What is the circulatory system? • Network of vessels used as a transportation system in the body with 6 major functions : • Transports : • Nutrients • Waste • Chemical messages • Plays a role in combating and infection • Provides a liquid environment for cells • Helps regulate the body’s pH level • Clotting to prevent loss of body fluids • Helps maintain a stable internal body temperature

  4. What makes up our circulatory system? • Blood • Blood Vessels • Heart • *Lungs

  5. Open circulatory system vs. Closed circulatory system • There are 2 kinds of circulatory systems : • The open circulatory system is primarily found in snails, insects and crustaceans • The closed circulatory system is commonly found in earthworms, squids, octopuses, and vertebrates

  6. Open Circulatory System • Has a heart (or multiple) but does not have a complete network of blood vessels • Blood is pumped to body cavities where it supplies the cells with oxygen and nutrients directly • The heart contractions pump the blood from one body cavity to the next, and when the heart relaxes blood is drawn back to the heart through pores

  7. Closed Circulatory System • This type of circulatory system has a closed network of blood vessels • Large blood vessels break off into smaller blood vessels to supply oxygen and nutrient carrying blood to all of the body tissues

  8. Blood

  9. Functions of Blood • Blood has six major functions : • Transporting materials (oxygen, nutrients, waste) • Help maintain internal temperature (homeostasis) • Providing a watery environment for cells • Combating disease and infection • Regulate body’s pH levels • Clotting to prevent los of body fluids

  10. Components of Blood • Red Blood Cells or Erythrocytes (45%) • White Blood Cells or Leukocytes (less than 1%) • Platelets (smallest component of blood – less than White Blood Cells) • Plasma (55%)

  11. What is blood made of? • Red Blood Cells or Erythrocytes • Primary function is to transport oxygen • Transport of oxygen is aided by hemoglobin • Oxyhemoglobin complex give blood its red colour, when oxygen is given up, the shape of the Red Blood Cell changes causing a reflection of blue light, this is why our veins appear blue • Red Blood Cells do not have a nucleus, which causes them to have a concave centre

  12. What is blood made of? • White Blood Cells, or Leukocytes • There are two types of leukocytes • Agranulocytes and granulocytes • White Blood Cells called Macrophages use Phagocytosis to destroy invading microbes • White Blood Cells do contain a nucleus, which makes them distinguishable from Red Blood Cells, and Platelets • Allergies

  13. What is blood made of? • Platelets • Are responsible for initiating blood clotting • Do not contain a nucleus – like Red Blood Cells • Look like 2 plates stacked together

  14. What is blood made of? • Plasma • Provides a liquid environment for the components of blood • Transports hormones • Transports vitamins and cholesterol

  15. Leukocytes WBCs Made in the bone marrow and lymph system Contains nucleus Part of the immune system Combats foreign cells by phagocytosis 10% minerals, vitamins, hormones, proteins, nutrients, antibodies, salt, oxygen, carbon dioxide, urea, uric acid and ammonia Water 90% Ratio of RBC:WBC 1000:1 Blood Plasma (55%) the liquid part of blood Cells (45%) Erythrocytes (RBC) Made in the bone marrow No nucleus Contain haemoglobin which transports oxygen Old RBCs are filtered and destroyed by the spleen. Platelets – involved in blood clotting

  16. Blood Bag • Cells = 45% • RBC’s represented by the marshmallows • WBC’s represented by the cotton balls • Platelets represented by the split peas • Plasma = 55% represented by the air in the bag

  17. Textbook Work • Page 245-246 • 7.2 Components of blood • Pg. 246 – Understanding concepts • Page 242-243 • 7.1 The important of the Circulatory system • Pg. 243 – Understanding Concepts

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