Active TransportPlasma Membrane Cell Processes Part 3

Active TransportThree types: primary, secondary and

endo/exocytosisAll use energy in some formGoes against concentration gradient: low to

highVideo:http

://www.youtube.com/watch?v=L4Tbi1ql-tU&safety_mode=true&persist_safety_mode=1

Primary Active TransportUses ATP to drive molecules across the

membrane AGAINST their concentration gradient.

Molecules will move from areas of low concentration to high concentration.

Requires a protein transporter called a carrier that will bind ATP and move the molecule across the membrane.

Usually large/ charged/ or hydrophilic moleculesVideo:http

://highered.mcgraw-hill.com/sites/9834092339/student_view0/chapter5/primary_active_transport.html

Adensoine Triphosphate (ATP)The molecule that provides chemical energy

for primary active transport. ATP binds to the carrier protein on the

intracellular side and causes a change in shape that allows the target molecule to be transported against its concentration gradient by the carrier.

Video:http://www.youtube.com/watch?v=bbtqF9q_pFw&safe=active

Secondary Active TransportUses potential energy from the concentration

gradient of one molecule to drive the movement of a second molecule against its concentration gradient.

The target molecule moves against the concentration gradient and the co-transported molecule moves with its concentration gradient.

Requires a protein transporter called a carrier.

Video:http://www.youtube.com/watch?v=6xqf6-RH6nk&safety_mode=true&persist_safety_mode=1

Co-transportation/Exploitative TransportationSymport AntiportThe target molecule and

the co-transported molecule move in the same direction.

The target molecule is going against its gradient.

The co-transported molecule is going with its gradient.

The target molecule and the co-transported molecule move in opposite directions.

The target molecule is going against its gradient.

The co-transported molecule is going with its gradient.

Endo/ExocytosisEndocytosis ExocytosisOccurs when cell engulf

material and bring it into the cell using a vesicle.

Uses energy in the form of ATP to move the vesicle into the cell.

Occurs when cells excrete material and move it outside of the cell using a vesicle.

Uses energy in the form of ATP to move the vesicle out of the cell.

Video: http://www.youtube.com/watch?v=DuDmvlbpjHQ&safe=active

Types of EndocytosisPhagocytosis PinocytosisOccurs when a cell

engulfs solid material. Examples:

Occurs when a cell engulf liquid material.

Examples:

Active Transport OverviewPrimary SecondaryUses ATP for energy to

drive molecules against their concentration gradient

Uses the potential energy of a co-transporter molecule to drive target molecules against their concentration gradient.

Can be symport or antiport.

Review of Passive and Active Transport:http://www.youtube.com/watch?v=dPKvHrD1eS4&safety_mode=true&persist_safety_mode=1http://www.youtube.com/watch?v=rR7NOSRyzhM&safety_mode=true&persist_safety_mode=1