active and passive transport1

7/27/2019 Active and Passive Transport1

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Quiz

1. Name and define the process shown by the

denture cleanser exper iment.

2. Name and define the process shown by thecarrot exper iment.

3. Define the following words.

Semi-Permeable:

Passive Transport:

Active Transport:


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Learning Goals

1d. Differentiate between active and passive

transport.

1e. Explain how large particles get into and out

of cells (endocytosis/excotytosis)


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Active Transport

Active Transport moving small particles

A process of transporting small particles

that requires the cell to use energy

Usually involves the movement of particles

from an area oflow concentration to an area

ofhigh concentration.


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.Active Transport


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Active Transport

Specific proteinsmove small moleculesfrom and area of

lower concentrationto higherconcentration.

ATP - energy usedfrom mitochondria


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Passive Transport

Passive Transport

moving small particles Diffusion and osmosis are examples of passive

transport.

Small particles move from an area ofhigh

concentration to an area oflow concentration.

Passive Transport is movement of particles across

a cell membrane without the use of energy by thecell through channels made of protein.

Ex: sugar, oxygen, carbon dioxide


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What process is this? Explain.


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Passive Transport


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Transport

Concepts

Passive

vs.Active

Passive no energy Active needs energy


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Endocytosis vs. Exocytosis


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Exocytosis

(moving larger molecules outside the cell)


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Exocytosis

Exocytosis

moving large particles out ofthe cell

Exocytosis is an active-transport process

A vesicle forms around a large particlewithin the cell.

The vesicle carries the particle to the cell

membrane.

The vesicle fuses with the cell membrane

and releases the particle to the outside of the

cell.


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CYTOPLASM

OUTSIDE THE CELL

SOLUTE

CARRIER PROTEIN

CYTOPLASM

OUTSIDE THE CELL

SOLUTE

CARRIER PROTEIN

CYTOPLASM

OUTSIDE THE CELL

SOLUTE

CARRIER PROTEIN


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Endocytosis

(moving larger molecules inside the cell)


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Endocytosis

Endocytosismoving LARGE particles

into the cell

Endocytosis is an active-transport process.

Cell surrounds a large particle, and encloses

the particle in a vesicle to bring the particle

into the cell

Vesicles are sacs formed from pieces of cell

membrane.

Ex: bringing in protein


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SOLUTE

CYTOPLASM

OUTSIDE THE CELL

CARRIER PROTEIN

CYTOPLASM

OUTSIDE THE CELL

CARRIER PROTEIN

SOLUTE

CYTOPLASM

OUTSIDE THE CELL

CARRIER PROTEIN

SOLUTE


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http://neurobiology.com/


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Endocytosis vs. Exocytosis


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Cell Membrane AKA plasma membrane

The cell membrane contains proteins,lipids, and phospholipids.

Some of the proteins and lipids control

the movement of materials into and outof the cell. Some of the proteins form

passageways. Nutrients and water

move into the cell, and wastes moveout of the cell, through these protein

passageways.

C ll M b i d f


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Cell Membrane is made of

molecules called phospholipids

which consist of: 1. a hydrophilic (water loving) head

2. two hydrophobic (water hating) tails

Phospholipids get their name because the group ofphosphate-bearing heads is combined with a fat, or

lipid, molecule. In water they orient themselves so

that their heads are exposed to the water and the

hydrophobic tails are away from water. They

cluster in a bilayer in which the tails of the

phospholipids interact with themselves and

exclude water, while the heads expose themselvesto water

active and passive transport1

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