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    Thursday, July 3, 2008
    Characteristics of gaseous exchange surfaces
    - Large surface area
    - Surrounded by blood capillaries(tiny blood vessels)
    - Thin walled (usually one-cell thick)

    Relate this to adaptations - Are these structural or behavioural adaptations? How does the environment affect how animals adapt for getting air(in order to stay alive and reproduce)?

    So how are the characteristics linked to adaptations? Mostly structural.
    - Large surface area
    Usually in response to amt of oxygen found in the environment, larger surface area means more gas can be exchanged within a period of time (more efficient gaseous exchange) SO if the amt of oxygen is lower, the larger the surface area will probably be.

    - Surrounded by blood capillaries(tiny blood vessels) / thin-walled
    Also in response to the amt of O2 in environment. The higher number of capillaries allow more efficient gaseous exchange. Thin walled exchange surface allow gases to pass through faster.

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