Notes 5.1 Passive Transport

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Standards:

CLE 3210.1.5 - Compare different models to explain the movement of materials into and out of the cell.

SPI 3210.1.8 - Compare active and passive transport.

RLE 2010.2.1 - Recognize the importance of homeostasis as a survival mechanism.

Objectives (today I will…)

1. Differentiate the different types of passive transport

2. Compare active and passive transport

3. Explore factors that affect passive transport

Types of Passive Transport(uses no energy)

• Diffusion

• Osmosis

• Facilitated Diffusion

Movement of solutes from an area of high concentration to an area of lower concentration.

Movement of water molecules from an area of high water concentration to an area of lower water concentration.

Diffusion of molecules across a membrane through channels and pores from an area of high concentration to an area of lower concentration.

Concentration

Concentration:

Two parts needed to determine concentration:• Solvent:

• Solute:

the amount of a substance in a given volume

The substance in the greatest volume, it is what the solute is dissolved in.

The substance in the smaller volume, it is the substance(s) that are dissolved in the solvent.

Concentration Example

Example: Salt water• Solvent?• Solute?

WaterSalt

Concentration Gradient

What is a gradient?change in the value of a quantity (as temperature, pressure, or concentration) with change in a given variable and especially per unit distance in a specified direction

Passive Transport = High to Low

Why will things move from high concentration to low concentration?

All molecules are moving.As they bump into each other they move faster until there is even space between them.

Passive Transport = EquilibriumEquilibrium:When the concentration of molecules is the same throughout the space the molecules occupy.

Activity

Gather in the designated space

How does this affect cells?

Diffusion:

Osmosis:

Solutes like oxygen, carbon dioxide, and other small molecules can get in or out of the cell with no energy needed.

Water can move freely in and out of the cell depending on its environment. (Can be good or bad depending on the environment.)

Video:

Watch the video and answer these questions with your table.

1.Describe what you see happening to the cells.

2. Relate this to the fact that the cell has a permeable membrane.

Facilitated Diffusion (Passive)

Definition:

Video - "Facilitated Diffusion" from my YouTube Channel

Diffusion of molecules across a membrane through channels and pores from an area of high concentration to an area of lower concentration.

Passive Transport Review:Three types:• Diffusion: • Osmosis:• Facilitated diffusion:

Common Characteristics:• Don't use any energy• Move from high to low concentration

small solutes (O2 or CO2) moving across the membrane

movement of water across the membrane

larger solutes (glucose) moving across the membrane through channels or pores

Exit Ticket (m.socrative.com, socrative app or a scrap piece of paper)

Room # 729158

•What is the difference between regular and facilitated diffusion?