Is within the cell and is made of mostly water and contains a wide variety of dissolved molecules and ions. Having the proper amount of water, proper ion concentration and proper pH within the cell is is of critical importance.
Forms the external boundary of a cell. (Made from phospholipids.)
Makes up the plasma membrane. Each phospholipid has a hydrophilic polar head (pointed outwards) and a non polar hydrophobic tail. (pointed inwards) in bilayer (shows bilayer)
Semi / Selectively permeable
Term used to describe cell membrane meaning that it only lets certain select things into cell
What types of particles are more likely to permeate the cell membrane?
Smaller non polar molecules.. Very difficult for ions.
Made of proteins that are imbedded in and span the phospholipid bilayer. A single channel will only let one specific type of molecule or ion pass through the plasma membrane
Example: Sodium channels only let sodium ions pass through.
Used by cells to facilitate the large scale movement of water molecules across their plasma membranes.. making cells highly permeable to water.
The net movement of water across a semi permeable membrane
Ideal situation for a cell. Cells won't gain or lose water, because the solute concentration is the same on both sides... Water goes where solute is more concentrated.
The solute concentration is greater outside the cell causing water to move outside of the cell.
Opposite of hypertonic... The concentration is greater inside the cell, causing water from the outside to come in.
Used to describe plants, this is what makes them stiff due to the amount of water inside the cell. It's the pressure exerted by the cell wall in a well watered plant. Loss of turgur results when plant doesn't have enough water / begins to wilt.
What happened when plant cell was placed in saltshriv solution?
Cells began to deflate. Appeared shrivled. Chloroplasts floated to middle.. no longer pushed to the edge of the cell.