Moving Cellular MaterialCh. 2.3

Focus 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

Check your vocabulary activity

See 2.3 Vocabulary You should already have the

definitions that have a dotted underline

Add the direction particles move to your vocabulary

Diffusion:When molecules move from HIGH to

LOW concentration

ALWAYS: High Low

Until 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

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

Passive transport – does NOT require cell’s energy (no ATP)– depends on differences in

concentration of substances – moves from high low

Active transport – requires cell’s energy (ATP)– Moves from low high

Activ

e tr

ansp

ort

Passive transport

3. Why are osmosis & diffusion important?

All living things have certain requirements they must satisfy in order to remain alive & to maintain homeostasis by:– Exchanging gases (O2 & CO2)– Taking in water, minerals, & food– Eliminating wastes

Remotes Review

What is the diffusion of water molecules?

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

Diffusio

n

Endocyto

sis

Active

transp

ort

Osmosis

Exocy

tosis

0 0 000

45

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

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

Diffusio

n

Endocyto

sis

Active

transp

ort

Exocy

tosis

0 000

45

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

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

transport

Diffusio

n

Osmosis

Active

transp

ort

Passiv

e tran

sport

0 000

45

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

the cell through what process?

A. OsmosisB. EndocytosisC. ExocytosisD. Passive

transport

Osmosis

Endocyto

sis

Exocy

tosis

Passiv

e tran

sport

0 000

45

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

needed for active transport?

A. Chloroplast B. NucleusC. Golgi bodiesD. MitochondriaE. Lysosome

Chloroplast

Nucleus

Golgi bodies

Mito

chondria

Lyso

some

0 0 000

45

Osmosis is the diffusion of water molecules though which of

these?

A. B. C. D.

0 000

A. channel proteinsB. waterC. cell wallD. Cell 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

During which process do cells take in needed nutrients from the environment

through carrier proteins?

A. B. C. D.

0 000

A. endocytosisB. active transportC. exocytosisD. passive transport

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

Link for animation

http://www.northland.cc.mn.us/biology/biology1111/animations/active1.swf