BIOL 112 Lecture Notes - Lecture 8: Phagocytosis, Exocytosis, Endoplasmic Reticulum

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27 Apr 2017
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BIOL 112 Full Course Notes
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Cells can live on their own occasionally: single cell organisms. There are 10 trillion cells in the human body. Maybe there is the same number of bacteria too in our body. In a cell you need to diffuse molecules. It takes a long time for molecules to travel. We subdivide everything into small things so that it takes less time to travel. If the cell is big, the volume is bigger than the surface area. Problem: it would take too long for the molecules to find what they are looking for. If the cell is small, the surface is bigger than the volume: bigger surface to volume ratio. Therefore molecules can easily diffuse into and out of the cell. Exception: eggs are a single cell and they are huge. In an egg, we do not need diffusion because it is just there to store stuff. This is why it can be so big.

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