Topic: Cell Processes

Aim: Explain the two types of cell transport.

Do Now: Define the term “concentration.”

HW: Work on your science fair project.

The sum of all life processes is known as

a.Regulation

b.Metabolism

c.Transport

d.Excretion

Metabolism is best described as: (multiple choice)?

a.control of enzyme activity

b.synthesis of macromolecules

c.breakdown of macromolecules

d.A and B

e.A,B, and C

Transport

•Circulation•Movement of materials into and out of cells

The chloroplasts move around inside the cell = TRANSPORT

Passive Transport

•Materials move from high low concentration

•NO ENERGY NEEDED

high

low

Weeee!!!

2 Types of Passive Transport

1. Diffusion: movement of materials from HIGH to LOW concentration

HIGH

LOW

DIFFUSION

•Molecules move until concentration becomes equal on both sides (equilibrium)

Cell membrane

Inside cell Outside cell

Cell membrane

Inside cell Outside cell

diffusion

Cell membrane

Inside cell Outside cell

EQUILIBRIUM

Diffusion through a membrane

2.Osmosis: diffusion of WATER

•Movement of WATER from HIGH to LOW concentration

Topic: Cell Processes

Aim: Explain the two types of cell transport.

Do Now: Define the term “concentration.”

HW: Work on your science fair project.

• http://zoology.okstate.edu/zoo_lrc/biol1114/tutorials/Flash/Osmosis_Animation.htm

Inside cell Outside cell

OsmosisCell membrane

High conc. of water molecules.

Low conc. of water molecules.

Inside cell Outside cell

High conc. of water molecules.

OsmosisCell membrane

OSMOSIS

Low conc. of water molecules.

OsmosisCell membrane

Inside cell Outside cell

OSMOSIS

EQUILIBRIUM. Equal water concentration on each side.

HIGH

LOW

+ energy

Active Transport

http://www.youtube.com/watch?v=1w10R9lv7eQ&feature=related

•Movement of materials from LOW to HIGH concentration

•ENERGY IS NEEDED!

Let’s summarize:

1. Explain the differences between passive transport and active transport.

2. What is the difference between diffusion and osmosis?

3. When will diffusion stop?

http://www.youtube.com/watch?v=1ZFqOvxXg9M

Review:

Which process requires cellular energy?

1. diffusion

2. passive transport

3. active transport

4. osmosis

Sodium ions are pumped from a region of lower concentration to a region of higher concentration in the nerve cells of humans. This process is an example of

1. diffusion

2. osmosis

3. passive transport

4. active transport

The movement of materials from lower to higher concentration requiring energy in the form of ATP is called 

1. movement

2. diffusion 

3. active transport

4. cell division

The movement of materials from higher to lower concentration is called 

1. diffusion 

2. active transport 

3. pinocytosis

4. 4. phagocytosis

Damage to which structure will most directly disrupt water balance within a single-celled organism?

1. ribosome

2. cell membrane

3. nucleus

4. chloroplast

The movement of water from an area of high concentration to an area of low concentration is known as

1. phagocytosis2. osmosis3. active transport4. pinocytosis