Brought to you byMr. _______

Cell Transport

The movement of substances across the ____ ___________.

There are 2 general categories of cell transport: ________- requires no energy. ________- requires energy.

Terms to Know

Concentration gradient- A __________ in the concentration of a substance across a space.

Example: 1 room has many bouncing balls in it. The room next door has none.

Equilibrium- A condition in which the concentration of a substance is _________ throughout a space.

Example: Open the door between the rooms, and the balls will enter the second room.

3 Modes of Passive Transport:

1. _______ _________2. _________3. Facilitated Diffusion

Simple Diffusion

The movement of a substance from an area of higher concentration ___ an area of lower concentration.

If diffusion is allowed to continue, _____________ eventually results.

Osmosis

The diffusion of water through a ____________ ____________ membrane.

3 Types of Solutions

1. ____________2. Hypotonic3. Isotonic

Hypertonic

Water moves ____ of the cell.

Hypotonic

Water moves ____ the cell.

Isotonic

Water moves in and out of the cell __________.

The net result is ___ _________.

This is called __________ _____________.

Facilitated Diffusion

A carrier protein binds to a specific substance on one side of the cell membrane, _________ it across, and releases it on the other side.

Active Transport

The transport of a substance across the cell membrane ________ its concentration gradient.

This means the cell is moving substances from an area of low concentration to an area of __________ concentration.

Modes of Active Transport

1. Sodium-Potassium Pump

2. Endocytosis ___________ ___________

3. Exocytosis

Sodium-Potassium Pump

This is a special carrier protein.

It carries __ sodium ions (Na+) out of a cell for every __ potassium ions (K+) it brings into a cell.

Both Na+ and K+ are going against their concentration gradient.

Occurs only in ____________ cells.

Endocytosis

The movement of a substance ____ a cell by a vesicle.

A vesicle is a small ____ formed by a cell membrane.

Phagocytosis

Taking in ________.“Phago” means

“___ _____”.

Pinocytosis

Taking in _______.“Pino” means “__

________”.

Exocytosis

The movement of a substance by a vesicle to the ________ of a cell.