Moving Cellular Materials SOL 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.

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Presentation transcript:

Moving Cellular Materials SOL 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 (O 2,CO 2, salts, sugars, amino acids) that are dissolved in H 2 O move from an area of higher concentration to an area of lower concentration.

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: 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: