6.4 - Limitations to cell size

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6 Terms

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Limitation to cell size

surface area to volume ratio (affects distance and so diffusion rate)

2
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Specialised structures to increase surface area

folds, microvilli, flattened or elongated cells - all increase SA to V ratio

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What happens to cells that are too large (SA:V)?

cells divide

4
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Chemicals regulating cell growth

growth factors (proteins which regulate cell growth and survival)

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Chemicals regulating mitosis

mitogens (peptides or small proteins that cause cells to enter mitosis by binding to receptors on plasma membranes)

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Exceptions to normal cell cycle

grow without dividing (neurons, fat, muscle fibres) vs divide without growing (fertilised egg cell)