Movement of Substance Across the Membrane

8/12/2019 Movement of Substance Across the Membrane

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Norhaida Bt Abu HassanD20061026400

Nur Aqilah Bt Norjandin

D20061026392

Nuraieni Bt Marwaji

D20061026398


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1.Analyzing the movement of substances

across the plasma membrane

2.Understanding the movement of substances

across the plasma membrane in everyday

life

3.Appreciating the movement of substances

across the plasma membrane


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Students already knew about:

Cell organization Cell structures and functions

The organelles

*Form 4 syllabus,Chapter 2: Cell Structures

and Organization.


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Glucose

Amino

acids

Fats Vitamins

Minarels

Water

Oxygen


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ACTIVE TRANSPORT

SIMPLE

DIFFUSION

OSMOSIS

FACILITATED

DIFFUSION

PASSIVE TRANSPORT


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PLASMA MEMBRANE

STRUCTURE

SIMPLEDIFFUSION

BRAINSTORMING

OSMOSIS

FACILITATED

DIFFUSION

ACTIVE

TRANSPORT


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Phospholipid

Phospholipid bilayer

Carrier

protein

Glycoprotein

Pore protein

Protein

Hydrophilic

head

Hydrophobictail


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Plasma membrane is arranged in a double layer

surrounding a cell and is composed of :

ProteinsPhospholipids

The hydrophilic head

(attracted to water)

A pair of hydrophobic tail

(repelled by water)


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Plasma membrane is semi-permeable

Molecules that CAN

move freely acrossplasma membrane are :

Molecules that CANNOT

move freely across plasmamembrane are:

These molecules move

across plasma membrane

in response to a

concentration gradient

(diffusion)

These substances require the aid

of transport proteins (facilitateddiffusion)

The transport proteins are:

> pore proteins

> carrier proteins

Lipid-soluble molecules

(fatty acids, glycerol)

and vitamins A, D, E, K

Small uncharged molecules

(oxygen and carbon dioxide)

Water

Large water-soluble molecules

(glucose, amino acids) and

small water-soluble inorganic

ions (K+,Na+,Ca2+)


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Vitamins

A,D,E,K

O2

Fatty

Acids

&

Glycerols

Glucose

CO2

Amino

Acids

H2

O

K+

Na+

Ca2+


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K+

Na+

Ca2+


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Glucose


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Amino

Acids


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Vitamins

A,D,E,K


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H2O


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O2


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Fatty

Acids

&

Glycerols


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CO2


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Plasma Membrane

is the net movement of molecules/ions from a

region of highconcentration to a region of

lowerconcentration.

Molecules

Concentration gradient

High concentration

Lower

concentration

occurs due to concentration gradientuntilequilibriumis achieved and the particles are

equally distributed in the system.


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BIOLOGY CHANNEL
http://localhost/var/www/apps/conversion/tmp/scratch_5/Video/Animation%20%20How%20Diffusion%20Works.swfhttp://localhost/var/www/apps/conversion/tmp/scratch_5/Video/Animation%20%20How%20Diffusion%20Works.swf


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Gaseous exchangebetween the alveoli

& blood capillaries

(respiration)


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Gaseous

exchange

in unicellularorganism

such asAmoeba


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Net movement of water molecules from a region

of low solute concentration to a region of high solute

concentration through a semi-permeable membrane.

Semi-permeable

membrane

Water moleculesSolute molecules

Dilute solution Concentration solution

High concentration of water,

low concentration of solute

High concentration of solute,

low concentration of water

Net movement of water

Does not require any energy and water molecules move

across the phospholipid bilayer and pores in plasma

membrane


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From the diagram, we can see the water molecules

move from the region of high water concentration

on left side of beaker towards the region of lower

water concentration on right side of beaker.

THE PROCESS OF OSMOSIS


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BIOLOGY CHANNEL
http://localhost/var/www/apps/conversion/tmp/scratch_5/Video/Animation%20%20How%20Osmosis%20Works.swfhttp://localhost/var/www/apps/conversion/tmp/scratch_5/Video/Animation%20%20How%20Osmosis%20Works.swf


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Application/Process Of The Osmosis In Life


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For food preservationUsing sugar, salt and

vinegar.

They make surroundingsolution hypertonic &

water leaves food by

osmosis.

Dehydrated food

prevents bacteria living

insideFish

Fruit

Application/Process Of The Osmosis In Life


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is the movement of hydrophilic molecules/ions across

plasma membrane with the help of protein. Energy is not

required. Carrier proteins are specific (carrier protein forglucose is only for glucose molecules only) .

Carrier protein changes its

shape to transport

molecules.

After molecule getsthrough, it resumes

its original shape to

let other similar

molecules into the

cell.

Molecule such

as glucose

moves to

binding sites of

carrier protein


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Carrier protein

changes its shape to

transport molecules.


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Application/Process of Facilitated Diffusion In Life

Nutrients absorption through the villi of small intestine


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BIOLOGY CHANNEL
http://localhost/var/www/apps/conversion/tmp/scratch_5/Video/Animation%20%20How%20Facilitated%20Diffusion%20Works.swfhttp://localhost/var/www/apps/conversion/tmp/scratch_5/Video/Animation%20%20How%20Facilitated%20Diffusion%20Works.swf


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Plasma Membrane

Molecules

Is the movement of molecules or ions from a

region of lowerconcentration to a region of higher

concentration across plasma membrane

ATP

Requires the use of both carrier proteinsandcellular energy (ATP)to transport molecules

against concentration gradient

Such reaction is found in all animal cells(nerve and muscle cells) which is the

sodium-potassium pump


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BRAINSTORMING

QUESTION 1

QUESTION 2

QUESTION 5

QUESTION 3

QUESTION 4


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When a cell uses a protein to pass a particle

through a cell membrane is called ________.

A

B

C

Facilitated Diffusion

Osmosis

Simple Diffusion

QUESTION 1


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QUESTION 2

What is the structure X ?

X

A Pore Protein

B Phospholipid Bilayer

C Carrier Protein


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QUESTION 3

Which of the following is NOT a passive

transport process?

A

B

C


Active Transport

Simple Diffusion


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QUESTION 4

This diagram above refer to what kind of

process?

A

B

C


Osmosis

Simple Diffusion


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QUESTION 5

Plasma membrane is..

A

B

C

Not permeable

Permeable

Semi-permeable

BRAINSTORMING

MENU


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Movement of Substance Across the Membrane

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