Biology Notes
Dr. Hensley / Mrs. Ingram
November 2015
Cell Membranes
Cell Membrane – Hold cell together and regulates what goes in and out of the cell. It is
flexible (fluid).
Phospholipids – What the cell membrane is made out of.
Proteins are stuck in the cell membrane to help transport nutrients for the cell’s functions
Outside of cell – Water Present
Head Loves
Water
Tails Hate
Water
Inside of cell – Water Present
Endocytosis – “Into” “Cells” – Movement of stuff into the cell
Exocytosis – “Out” “Cells” – Movement of stuff out of the cell
Protein
Channel for
transporting
across the
membrane
Where Does Water Go?
Hypertonic
(More)(Solute)- Has more solute outside of the cell than inside.
When there is more solute outside of the cell, the cell will send water outside and cause the cell to shrink.
Hypotonic
(Low) (Solute) – Has more solute inside of the cell than outside. When there
is more solute inside the cell, water will enter the cell and cause it to swell and possibly pop.
Isotonic
(Same) (Solute) – The inside and outside of the cell have the same amount of solute present. Water will
go in and out of cell equally and the cell stays the same size.
Extra Information:
Phagocytosis – “Eat” – the process of taking a large solid piece of food into the cell
Pinocytosis – “Drink” – the process of taking in liquids into the cell