How are the cells of a multicellular animal connected to the external environment? Briefly describe how nutrients and wastes are transferred from these cells to the external environment.
What will be an ideal response?
ANSWER: Cells are connected by the aqueous extracellular fluid (ECF). The ECF has two components: the plasma (fluid portion of the blood) and the interstitial fluid (fluid surrounding the cells). The ECF is the transitional zone connecting the intracellular fluid (ICF) to the external environment.
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