12R Transport Systems

12R Transport Systems

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Which of the two organisms shown on the previous slide needs a circulatory system? Why?

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How does the size of an organism influence its need for a circulatory system?

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How does the metabolic demand of an organism influence its need for a circulatory system?

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How does the SA:Vol of an organism influence its need for a circulatory system?

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What is a circulatory system? Come up with a general definition...

A circulatory system is an interface between the environment and respiring cells. It must contain:

• A pump

• Fluid to transport O₂, nutrients, CO₂ and metabolites

• A system of vessels to deliver fluid between an exchange surface and tissues

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What are some possible advantages and disadvantages of closed circulatory systems?

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What are some possible advantages and disadvantages of open circulatory systems?

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What are some possible advantages and disadvantages of a single circulatory system?

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What are some possible advantages and disadvantages of a double circulatory system?

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In a closed circulatory system, blood is kept inside blood vessels. Suggest two advantages of keeping blood inside vessels.

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Fish have a single, closed circulatory system. State the meaning of the terms single circulatory system and closed circulatory system.

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Give three reasons why a large, multicellular animal, such as a mammal, needs a transport system.