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L5 circulatory systems

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  • 1. Exchange and transport Transport in mammals We are learning to… Explain the need for transport systems in multicellular organisms in terms of size, activity and SA:Vol Describe and explain the terms ‘single and double circulation’ and ‘open and closed circulatory systems’
  • 2. Single circulation
  • 3. Double circulation
  • 4. Comparison Single Double Pulmonary and systemic circulations in series Pulmonary and systemic circulations in 8 loop Low activity/ Ectothermic High activity/ Endothermic Limited rate of transport to tissues Higher rate of transport to tissues
  • 5. Open and closed circulatory systems
  • 6. Open v Closed Circulatory Systems Open Circulatory System Closed circulatory system Heart pumps into open cavities, blood vessels carry blood to all parts of the body Blood remains within a network of vessels and does not leave Has no arteries to increase BP, therefore has more blood at low pressure Carries blood at high pressure and delivers blood quickly. Requires less energy for distributing blood Suitable for animals with a fast metabolism Better for animals with a small body and slow metabolism because less active animals with a low metabolism do not require high amounts of oxygen The animal is able to move, digest and eliminate waste quickly
  • 7. Heart Systems
  • 8. Heart Systems