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Bio 1.2.1
23
Transcript
Homeostasis
Equilibrium in a cell
- Ex: organisms regulating their temperature, water levels, oxygen levels and pH
Active vs. Passive Transport
- Active transport- movement of materials from areas of lower concentration to areas of higher concentration,“up”the concentration gradient.Requires a cell to use energy (ATP).
- Passive transport- the movement of materials across the cell membrane without the use of energy (ATP).
Diffusion & Osmosis
Bio 1.2.1
Explain how homeostasis is maintained in a cell and within an organism in various environments
Diffusion and osmosis are both forms of passive transport.
- Diffusion-Movement of molecules from areas of high concentration to areas of low concentration
- Osmosis-diffusion of molecules across a cell membrane from areas of high concentration to areas of low concentration.
Plasma Membrane
The plasma membrane is made up of a phospholipid bilayer and one side of the membrane has hydrophilic heads and the other side has hydrophobic heads.
Functions of the Plasma Membrane
- Allows certain materials to enter and leave the cell (selectively permeable)
- Separates the outside environment from the inside of the cell
- Allows the cell to excrete wastes
Red Blood Cells
&
Osmotic Pressure
Buffers
Buffers resist changes in a cell. This allows for cells to maintain temperature, glucose levels, and water balance.
When red blood cells are put into salt water, they will shrink. When red blood cells are put into distilled water, they will swell.
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