cells vary in shape justify the statement
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Because different cell types have different functions in a multicellular organism.
Each cell type "runs" a particular subset of its genetic program, under control of various signals coming from other cells, nearby or far away in the body. The particular subset (which can vary over time) determines the cell's function, and very frequently also its shape. Consider, for example, that a disc-shaped neuron would hardly be able to perform its function of taking signals from and sending signals to millions of other neurons; or that a large and very ramified red blood cell would hardly be useful as an oxygen and CO2 transporter as it would tangle and clot all over the blood stream.
As has been said for a long time now: Form follows function. At least in a first approximation. Multicellular organisms aren't an exception--in fact, they are an excellent example.
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Each cell type "runs" a particular subset of its genetic program, under control of various signals coming from other cells, nearby or far away in the body. The particular subset (which can vary over time) determines the cell's function, and very frequently also its shape. Consider, for example, that a disc-shaped neuron would hardly be able to perform its function of taking signals from and sending signals to millions of other neurons; or that a large and very ramified red blood cell would hardly be useful as an oxygen and CO2 transporter as it would tangle and clot all over the blood stream.
As has been said for a long time now: Form follows function. At least in a first approximation. Multicellular organisms aren't an exception--in fact, they are an excellent example.
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sweety105:
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no cells does not vary shape . the shape of cell does not change with increase of the body but it increase the number of cells
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