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Module 2 Exchange and transport

Module 2 Exchange and transport. 1.2.5 Transport in animals. Success Criteria. Learning Objectives . Explain the need for transport systems in multicellular animals in terms of size, activity and surface-area-to-volume ratio.

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Module 2 Exchange and transport

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  1. Module 2Exchange and transport 1.2.5 Transport in animals

  2. Success Criteria Learning Objectives Explain the need for transport systems in multicellular animals in terms of size, activity and surface-area-to-volume ratio. Explain the meaning of the terms single and double circulatory systems with reference to the circulatory systems of fish and mammals List the features of a good transport system (Grade E - D) Explain why large, active animals need a transport system (Grade C –B) Explain why a double circulatory system is more efficient than a single circulatory system (Grade B – A) FISH DISSECTION?

  3. Closed circulatory systems

  4. nutrients waste products Why need a transport system? Single-celled organisms, such as bacteria and amoeba (below), can obtain nutrients and excrete waste simply by diffusion. Multi-cellular organisms, such as insects, fish and mammals, require a more specialized transport system. Why is this?

  5. Surface area to volume ratio In larger organisms, diffusion of substances would occur far too slowly to enable them to survive: This is not just because of its size, however: more important is an organism’s surface area to volume ratio. Single-celled organisms have a very large surface area to volume ratio, because the diffusion path is so short. Describe 3 factors that would affect the need for transport systems.. • List the features of a good transport system (Grade E - D)

  6. 1 Size 1)If an animal has several layers of cells, any oxygen and nutrients will not reach the deeper cells within the body • Explain why large, active animals need a transport system (Grade C –B)

  7. 2 Surface Area to Volume Ratio • Larger animals have a small surface-area-volume-ratio. • Larger volume due to range of tissues. • Their surface area is not large enough to supply all the oxygen and nutrients needed by internal cells.

  8. 3 Level of Activity • If an animal is active it will require a good supply of oxygen and nutrients to supply the energy for movement. • Mammals also require more energy to keep themselves warm.

  9. Features of a good transport system Division of labour Our circulatory system has 2 loops- one sends blood to the lungs-pulmonary system and the other sends blood to the rest of the body – systemic system.

  10. Features of a good transport system • Medium/fluid to carry nutrients and oxygen • Pump to create pressure • Exchange surface • Vessels/tubes to contain medium • 2 circuits • Pick up oxygen • Deliver oxygen

  11. Closed circulatory systems

  12. Advantages of Double over Single • Double circulatory system – blood travels through the heart twice for each complete circuit of the body • Efficient so deliver nutrients quickly • Can increase pressure of blood flow • Quicker supply oxygen • Can keep pressure to exchange surface low to avoid damage

  13. Plenary: True or False • Mammals are more active that fish due to need to maintain body temperature • Surface area to volume ratio effects need for a transport system • Single circulatory system means a single chambered heart • Systemic circulation means the route of blood through the lungs • Surface area to volume ratio is effected by an animals shape

  14. Plenary: True or False • Mammals are more active that fish due to need to maintain body temperature • Surface area to volume ratio effects need for a transport system • Single circulatory system means a single chambered heart • Systemic circulation means the route of blood through the lungs • Surface area to volume ratio is effected by an animals’ shape • Any answers you wrote false for now please write what the true statement would be

  15. Plenary: Answers • Mammals are more active that fish due to need to maintain body temperature • True • Surface area to volume ratio effects need for a transport system • True • Single circulatory system means a single chambered heart] • False: Single circulatory system means blood does one circuit • Systemic circulation means the route of blood through the lungs • False: Systemic circulatory system means the route of blood through the body • Surface area to volume ratio is effected by an animals’ shape • True

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