Unit 1 Cells and Systems

Chapter 1 The cell is the basic unit of life.

1.3 Diffusion, Osmosis, and the Cell Membrane


1.3 Introduction Paragraph pg.40
Diffusion is the movement of particles from higher area of concentration to lower area of concentration. Osmosis is the movement of water from higher area of concentration to lower area of concentration. The cell membrane is selectively permeable and allows for the transport of materials through it. If the cell membrane only had one entrance and exit. This would cause traffic jams of materials trying to get in or out of the cell, it would would also block the processes of diffusion, which the cell needs for its survival.


1.3 Introduction page 40


Questions
Answers
What is diffusion?
Diffusion is the movement of particles from an area of higher concentration to an area of lower concentration.


Osmosis involves what kind of particles?
Osmosis involves water particles moving from an area of higher concentration to an area of lower concentration.


What does the cell membrane do?
The cell membrane allows for the transport of materials through it.


In the imaginary colony, Newo, what was the problem with the protection dome?
The problem was, the protection dome only had one exit and one entrance.


Name two problems created if the cell membrane had only one entrance and exit.
The Food and Nutrient Fluid Transportation Group had to find other ways to get in. The Waste Control Group also has to find other ways to get out of the protection dome.