Moving Cellular MaterialsSOL BIO 4.d

Fluid Mosaic Model:A mosaic is a structure made up of many different parts.

The plasma membrane of a cell is composed of different kinds of macromolecules.

Phospholipid

bilayer

Passive Transport:

• PASSIVE TRANSPORT- DOES NOT require energy to move materials through the cell

membrane

3 Types of Passive Transport:

DIFFUSION- molecules of a substance will move from an area of high concentration to an area of low concentration until they reach equilibrium

 

• Diffusion occurs in cells when substances (O2,CO2, salts,

sugars, amino acids) that are dissolved in H2O move from an area of higher concentration to an area of lower concentration.

3 Types of Passive Transport:

3 Types of Passive Transport:

3 Types of Passive Transport:

DIFFUSION

3 Types of Passive Transport:

2. OSMOSIS (diffusion of water)-the movement of water

molecules through a semi-permeable membrane from an

area of greater water concentration or pressure to

an area of lesser water concentration or pressure

3 Types of Passive Transport:

OSMOSIS

3 Types of Passive Transport:

• Hypertonic- too much solute, not enough water; cell will shrink & wrinkle

• Hypotonic- too much water, not enough solute; cell will swell up, expand

• Isotonic- equal parts water and solute; water moves in & out of the cell in dynamic equilibrium

3 Types of Passive Transport:

OSMOSIS

3 Types of Passive Transport:

OSMOSIS

3 Types of Passive Transport:

3. FACILITATED TRANSPORT- requires transport proteins in the cell membrane to move

materials into and out of the cell

3 Types of Passive Transport:

FACILITATED TRANSPORT

Active Transport:

• ACTIVE TRANSPORT- requires ENERGY to move materials through the cell membrane

Active Transport:

2 Types of Active Transport:

• ENDOCYTOSIS- requires ENERGY to move materials INTO the cell membrane

• EXOCYTOSIS- requires ENERGY to move materials OUT OF the cell membrane

Active Transport:

Active Transport:

Active Transport: