Cell Membrane Transport

Active Transport

Process that moves materials across a cell membrane against a concentration gradient

Requires energy

Passive Transport

Follows the concentration gradient (materials move from an area of high concentration to low concentration)

Does NOT require energy

Concentration Gradient

When there is a difference in concentration of
molecules on either side of a cell membrane

3 types of Passive Transport

Diffusion

Facilitated diffusion

Osmosis

Diffusion

Process in which molecules move from areas of higher concentration to areas of lower concentration

Facilitated Diffusion

Movement of molecules across a membrane by carrier proteins

Does not require energy

Osmosis

The diffusion of water molecules through a selectively permeable membrane. Water will move from areas of high concentration of water to areas of lower concentration.

Osmotic Pressure

the force exerted to move water through a membrane

Turgor

the rigidity or stiffness of plants due to the water present in their cells

What is A?

Phospholipid bilayer

What is B?

Integral protein

What is F?

Fatty acid tails

What is G?

Phosphate head

What is H?

Peripheral Protein

What is I?

Cholesterol

What is C?

Glycoprotein

What is E?

Glycolipids

What does G do?

Attracts water

What does I do?

Helps maintain flexability

What does C do?

Involved in cell-to-cell recognition

What does F do?

Repels water

What does B do?

Helps transport certain materials across the cell membrane

Hypotonic

Bursts

isotonic

stays the same

Hypertonic

Shrink

Membrane Pumps

Protein pumps that transport calcium, sodium,
and potassium ions across a membrane

Endocytosis

Taking materials into the cell by pockets and
infoldings of the cell membrane

Exocytosis

Contents of the cell are forced out by the pocket
membrane fusing with the cell membrane

Examples of endocytosis

Phagocytosis and Pinocytosis

Phagocytosis

Large particles are taken in

Pinocytosis

Cells take up liquid from the surrounding
environment