The Cell in Its Environment

THE CELL IN ITS ENVIRONMENT

POWER POINT NOTES

Key Terms

•Some substances can pass through the ______while others cannot.

•In diffusion, molecules move from an area of ______concentration to an area of _

______concentration.

•The diffusion of water molecules through a selectively permeable membrane is ______.

•

•The movement of dissolved materials through a cell membrane without using cellular energy is

______.

•The movement of materials through a cell membrane using ______is called active transport.

Introduction

•______have structures that protect their contents from the world outside.

•All cells are surrounded by a ______that separates the cell from the outside environment.

•The cell membrane is______, which lets some things enter and leave the cell.

•Name 3 substances that enter and exit a cell through either passive or active transport.

What is Diffusion?

•The process by which molecules move from an area of ______concentration to an area of

______concentration.

•The main method by which ______molecules move across the cell membrane.

What is Osmosis?

•The diffusion of ______molecules through a selectively permeable membrane.

•Many cellular processes depend on ______because cells cannot function properly

without adequate ______.

How is Osmosis related to Diffusion?

•______molecules move by ______from an area where they are highly concentrated through the cell membrane to an area where they are less concentrated.

Effects of Osmosis on Cells

•Cells placed in distilled water will ______and can possibly ______.

•Cells placed in a concentrated salt solution will ______and ______.

What is Passive Transport?

•The movement of ______through a cell membrane ______using energy.

•Diffusion and osmosis are examples of ______transport.

What is Active Transport?

•The movement of materials through a cell membrane ______the cell’s energy.

•Give two reasons why active transport may occur instead of passive transport (diffusion/osmosis).

Methods Active Transport

•List 3 ways a cell uses active transport to move molecules/substances between the cell and its environment.

“Transport” is like Riding a Bike?

• Passive Transport is like riding a bike ______a hill.

• Active transport is like riding a bike ______a hill.

Why are Cells Small?

•The smaller they are the ______it is for them to do their ______.