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Transcript of Honors Biology
The movement of materials
into or out of the cell through
the cell membrane
Diffusion refers to the process of molecules mixing as a result of their random motion
The net movement of water molecules through a semi-permeable membrane from a region of higher water concentration to an area of lower
The direction that water moves tends to equalize the concentrations on the two sides of the membrane
The process of spontaneous passive transport of molecules
or ions across a cell membrane
using imbedded proteins
Does NOT require energy!
Unit #3 Notes: Cell Transport
3. Facilitate Diffusion
1. Sodium-Potassium Pump
The process that pumps sodium out of
cells while pumping potassium into cells, both
against their concentration gradients. This
pumping requires energy and is needed for
cells to function properly
Transportation of molecules (such as
proteins) into the cell by engulfing them
in an energy-using process
Cells transport molecules (such as
proteins) out of the cell
Exocytosis and endocytosis are used
by cells because most substances important
to them are polar molecules that cannot
pass through the hydrophobic portion
of the cell membrane by passive