Cell Transport: Passive Transport Lesson

Cell Transport

Open Ended

In order for a cell to survive, what sort of substances would need to get into or out of the cell

Open Ended

What structure do you think a substance would need to have in order to get into or out of the cell?

Open Ended

Would it be easier for you to get to a place by walking with or against the wind? Uphill or down hill?

Notes on Molecule Movement & Cells

Passive Transport

Cells & Their Environment

2 Types of Movement

Passive Transport

Active Transport

Multiple Choice

This cell organelle helps organisms maintain homeostasis by controlling what substances may enter or leave cells.

• vacuole

• cell membrane

• nucleus

• cell wall

Passive Transport

• No energy required

• Molecules move due to a gradient differences in concentration, pressure, charge

• Move to equalize gradient

  From a region (or area) of high concentration toward a region of low concentration

Diffusion

• A way that  cells maintain homeostasis is by controlling what substances moves into or out of their cell membrane.

• Cells have to use energy to transport some substances across the cell membrane.

• Other substances move across the cell membrane without any use of energy by the cell.

Multiple Select

True or False? Passive transport does not require energy

• True

• False

Diffusion cont.

Molecules move to equalize concentration

Multiple Choice

Which beaker represents diffusion that has occurred over a long period of time?

• Beaker 1 (left)

• Beaker 2 (middle)

• Beaker 3 (right)

Definition of Diffusion

The movement of a substance from an area of high concentration to an area of lower concentration that is caused by the random motion of particles of the substance.

Osmosis

• Special type of diffusion

• Often involves movement of water into the cell OR out of cell

Definition of Osmosis

• The diffusion of only water molecules through a cell membrane

Facilitated Diffusion

• Selectively permeable membrane

• Carrier proteins are used to let large sugar molecules such as glucose pass the membrane down the membrane's gradient

• Specific channel protein are used to help molecules or ions enter or leave the cell

• **No energy is used**

Definition of Facilitated Diffusion

When molecules pass through a cell membrane using special proteins called transport proteins (carrier or channel proteins).

Open Ended

Use the image to outline the steps of how you think facilitated diffusion works

Process of Facilitated Transport

• 1) Protein binds with molecule

• 2) Shape of protein changes

• 3) Molecule moves across membrane

McGraw-Hill Animation 1

How Does Facilitated Diffusion Work?

Multiple Select

Check for Understanding:

Movement of particles from high to low concentration.

• Passive Transport

• Active Transport

Multiple Select

True or False: Passive transport occurs when molecules move from an area of low concentration to high concentration.

• True

• False

Multiple Choice

The movement of water across a membrane moving with the concentration gradient is called ________.

• facilitated diffusion

• osmosis

• active transport

• None of the above

Multiple Select

In facilitated diffusion, a _____ is needed to help molecules move across the cell membrane.

• lipid

• amino acid

• carbohydrate

• protein

Multiple Choice

True or False:

In passive transport, no energy is needed in order for molecules to move across the membrane.

• True

• False

Multiple Select

Diffusion across a cell membrane works best with large, complex molecules.

• True

• False

How Red Blood Cells Travel from the Heart to the Lungs 

https://www.britannica.com/video/82437/circuit-system-lungs-body-tissues-blood-cells

Oxygen’s surprisingly complex journey through your body - Enda Butler

https://www.youtube.com/watch?v=GVU_zANtroE

Active Transport

• Different from passive transport because it requires energy.

• Active transport is necessary to make particles move against their natural tendency.

• In active transport, particles move from less crowded (low concentration) to more crowded (high concentration) using ENERGY.

Multiple Select

TRUE OR FALSE? Active Transport is a passive process.

• True

• False

2 Types of Active Transport

• Endocytosis

• Exocytosis

McGraw-Hill Animation 2

Active Transport

Endocytosis

-Movement of large material such as particles, organisms, large molecules into cells

-Requires channel proteins and carrier proteins

Multiple Select

During active transport, molecules are moved from a region of _____ concentration to _____ concentration

• high, low

• low, high

Process of Endocytosis

• Plasma membrane surrounds material

• Edges of membrane meet

• Membranes fuse to form a vesicle

Multiple Choice

A process in which cells surround and engulf substances that are TOO BIG to enter the cell is known as...

• Pinocytosis

• Endocytosis

• Phagocytosis

• Receptor-mediated

Multiple Choice

Which is true about active transport?

• It moves material from low to high concentration

• It does not require energy

• It moves material from high to low concentration

Multiple Select

True or False? Endocytosis brings large things into the cell and exocytosis brings large things outside of the cell

• True

• False

Exocytosis

-Reverse of endocytosis

-Cell releases material

Open Ended

What is the difference between active and passive transport?

Open Ended

What questions do you still have about cell transport?