Transcript Moving Cellular Material - (www.ramsey.k12.nj.us).

Moving Cellular
Material
Chapter 2, Lesson 3
Membranes
• Control the movement of materials in and out of
cell.
– Semipermeable – only certain substances can pass
through.
– There are many different ways for a substance to pass
through the membrane.
• Process depends on the physical and chemical properties of
the substance.
Passive Transport
• The movement of substances through a cell
membrane
– No energy
– Usually small molecules (O2 and CO2)
– Depends on the amount of substances on each side
of the membrane.
Diffusion
• The movement of substances from an area of
higher concentration to an area of lower
concentration.
Passive Transport - Osmosis
The diffusion of water molecules through a selectively
permeable membrane. (No energy required)
Red Blood Cells
Facilitated Diffusion
• When molecules pass
through a cell
membrane using
special proteins called
transport proteins.
Active Transport
The movement of materials through a cell membrane using
energy. (Moves from low to high concentration)
Endocytosis
• The process during which a cell
takes in a substance by
surrounding it with the cell
membrane.
Exocytosis
• The process during which a cell’s vesicles
release their contents outside the cell.