5.+Homeostasis

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=**5. Explain how cells maintain homeostasis.**= In order to maintain homeostasis cells use diffusion. Which means molecules move in and out of the cell to create an equal amount of molecules inside and outside of the cell.Homeostasis is like equilibrium,both try to keep things equal.Cells transport substances in and out of the cell. There are two types of transport. They are active and passive transport. Passive transport uses diffusion to transport substances(it uses no energy), like water,oxygen, and carbon dioxide.Its selectively permeable;its based on size.The molecules go through small pores. Active trasport use ATP energy, it requires a transoprt protein. The transport protein binds with the molecule then changes shape to let the molecules inside the cell. One example ofactive transport is the potassium ion.