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    number of cells it contains , surface area to volume rate substances needed by the organism and why are they needed . topic to cover cardiology
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    Don't really understand the question here but I'm assuming that its "why do we need a transport system for multi cellular organisms?"

    If that is the question then, this is my answer:

    Transport systems are required because such multi cellular organisms are common to have a small surface area to volume ratio. As a result, they cannot absorb molecules such as O2 or glucose in the same way that unicellular organisms can. Hence, they require a different means of transporting molecules to and away from cells.
 
 
 
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Updated: November 18, 2015
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