Ch. 2.3: Cell transport

Essential Questions

1. How do materials enter & leave cells?

2. What is the difference between passive transport & active transport?

3. Why are osmosis and diffusion important?

Cell transport

Passive transport

Diffusion

Facilitated diffusion

Osmosis

Active transport

Endocytosis Exocytosis

1. How do materials enter & leave cells?transport = move

No energy/ATP Energy/ATP

Copy this chart

Diffusion:When molecules move from HIGH to

LOW concentration

ALWAYS: High LowUntil both sides reach equilibrium.

1. How do materials enter & leave cells?

Draw this example of diffusion.

Osmosis:The diffusion of WATER molecules

through a membrane.

It always moves from areas with higher concentration of WATER to areas of lower concentration of water.

Dilute solution Concentrated solution(high water) (low water)

1. How do materials enter & leave cells?

(water)

Facilitated diffusion:When molecules use transport

proteins to pass through a cell’s membrane.

2 types of transport proteins:Carrier proteins – carry large molecules

(glucose)Channel proteins – form pores through

membrane

1. How do materials enter & leave cells?

Facilitated diffusion

Active Transport:When substances move through the

cell membrane using the cell’s energy (ATP).

Low High

Uses carrier proteins to get nutrients from the environment and to get rid of waste materials.

1. How do materials enter & leave cells?

Active Transport

Endocytosis: (endo = enter)takes in a substance by surrounding it (&

engulfing)

Exocytosis: (exo = exit)Getting rid of contents outside the cell

1. How do materials enter & leave cells?

Endocytosis & Exocytosis

Passive transport vs. Active transport

Passive transport Active transportBoth

- No energy (ATP)

- High Low

- Uses energy (ATP)

- Low High, or large molecules

- Transport substances through cell membrane

3. Why are osmosis & diffusion important?

All living things have certain requirements they must satisfy in order to remain alive & to

Cells use passive & active transport to maintain homeostasis by:– Exchange gases (O2 & CO2)– Get water, minerals, & food– Get rid of wastes

Remotes Review

What is the movement of substances from areas of high concentration to low

concentration?A. DiffusionB. EndocytosisC. Active transportD. Exocytosis

45Diffusio

n

Endocytosis

Active

transp

ort

Exocyt

osis

0 000

What is the movement of substances from areas of high concentration to low

concentration?A. DiffusionB. EndocytosisC. Active transportD. Exocytosis

45Diffusio

n

Endocytosis

Active

transp

ort

Exocyt

osis

0 000

What is the diffusion of water molecules?

A. DiffusionB. EndocytosisC. Active transportD. OsmosisE. Exocytosis

Diffusion

Endocytosis

Active

transp

ort

Osmosis

Exocyt

osis

0 0 000

45

What is the diffusion of water molecules?

A. DiffusionB. EndocytosisC. Active transportD. OsmosisE. Exocytosis

Diffusion

Endocytosis

Active

transp

ort

Osmosis

Exocyt

osis

0 0 000

45

What is the movement of substances across a membrane that requires cell

energy?A. DiffusionB. OsmosisC. Active transportD. Passive

transport

45Diffusio

n

Osmosis

Active

transp

ort

Passive tr

ansp

ort

0 000

What is the movement of substances across a membrane that requires cell

energy?A. DiffusionB. OsmosisC. Active transportD. Passive

transport

45Diffusio

n

Osmosis

Active

transp

ort

Passive tr

ansp

ort

0 000

When substances are too large to pass through the membrane, they must enter

the cell through what process?A. OsmosisB. EndocytosisC. ExocytosisD. Passive

transport

45Osm

osis

Endocytosis

Exocyt

osis

Passive tr

ansp

ort

0 000

When substances are too large to pass through the membrane, they must enter

the cell through what process?A. OsmosisB. EndocytosisC. ExocytosisD. Passive

transport

45Osm

osis

Endocytosis

Exocyt

osis

Passive tr

ansp

ort

0 000

Which cell part is responsible for making and storing the energy (ATP)

needed for active transport?A. Chloroplast B. NucleusC. Golgi bodiesD. MitochondriaE. Lysosome

45Chloroplast

Nucleus

Golgi bodies

Mitoch

ondria

Lysoso

me

0 0 000

Which cell part is responsible for making and storing the energy (ATP)

needed for active transport?A. Chloroplast B. NucleusC. Golgi bodiesD. MitochondriaE. Lysosome

45Chloroplast

Nucleus

Golgi bodies

Mitoch

ondria

Lysoso

me

0 0 000

Osmosis is the diffusion of water molecules through which of

these?

A. B. C. D.

0 000

A. channel proteinsB. waterC. cell wallD. membrane

45

Osmosis is the diffusion of water molecules through which of

these?

A. B. C. D.

0 000

A. channel proteinsB. waterC. cell wallD. membrane

45

What does facilitated diffusion require to pass molecules through a cell

membrane?

A. B. C. D.

0% 0%0%0%

A. waterB. glucoseC. light energyD. transport

proteins

45

What does facilitated diffusion require to pass molecules through a cell

membrane?

A. B. C. D.

0% 0%0%0%

A. waterB. glucoseC. light energyD. transport

proteins

45

How does active transport move substances through the cell

membrane?

A. B. C. D.

0 000

A. using the cell’s energy

B. by osmosisC. by facilitated

diffusionD. using water

45

How does active transport move substances through the cell

membrane?

A. B. C. D.

0 000

A. using the cell’s energy

B. by osmosisC. by facilitated

diffusionD. using water

45