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Homeostasis

Homeostasis. By Jose Campuzano. What’s Homeostasis?. Homeostasis is the stable internal conditions of a living thing. This system is made of other tiny systems that keep the process of homeostasis alive.

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Homeostasis

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  1. Homeostasis By Jose Campuzano

  2. What’s Homeostasis? • Homeostasis is the stable internal conditions of a living thing. • This system is made of other tiny systems that keep the process of homeostasis alive. • For example passive transport. This means that cell membranes help organisms maintain homeostasis by controlling what substances may enter or leave cells.

  3. Diffusion • Diffusion is the movement of molecules from an area of higher concentration to an area of lower concentration. • For example a sugar cube dissolving in water. • The yellow dots are sugar molecules.

  4. Concentration gradient is the difference between two concentrations Right after diffusion happens, the equilibrium sets in and the concentration of a substance is the same throughout a space and random movements occur. Osmosis-

  5. Different concentrations • Hypotonic- when the concentration of solute molecules outside the cell is lower than the concentration in the cytosol, so solution outside is hypotonic to the cytosol. • Hypertonic- when the concentration of solute molecules outside the cell is higher than the concentration in the cytosol, so the solution is hypertonic to the cytosol.

  6. More concentrations • Isotonic- when concentrations of solutes outside and inside the cell are equal, the outside solution is said to be isotonic to the cytosol. Contractile vacuoles- an organelle in protists that expels water.

  7. Turgor Pressure • Pressure that water molecules exert against the inside of the cell wall.

  8. Plasmolysis • When cells shrink away from the cell walls and turgor pressure is lost.

  9. Cytolysis • The bursting of cells from absorbing to much liquids. For example when a human red blood cell is placed in a hypotonic environment, the water diffuses into the cells causes them to swell and eventually burst.

  10. Ion channels • Passive transport that involves membrane proteins. • Endocytosis- the process of when cells ingest external fluid • Vesicle- membrane bound organelles

  11. exocytosis • The reverse of endocytosis

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