Download life science– cell membrane

LIFE SCIENCE– CELL MEMBRANE
What is the purpose of the cell membrane?
PL
E
____________________________________________________________________________________
How is the cell membrane like a security guard?
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List three substances that can easily pass through the cell membrane.
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Why is the cell membrane considered ‘semi-permeable’?
AM
____________________________________________________________________________________
Fill in the chart below displaying the three ways a substance can move through a cell membrane.
Method
Particles that pass through
Is energy required?
Direction of flow
Diffusion

Osmosis

EX
Active Transport

Why do you think active transport requires energy while diffusion and osmosis do not?
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LIFE – CELL MEMBRANE
What is the purpose of the cell membrane?
PL
E
It controls what goes in and out of the cell._________________________________________
How is the cell membrane like a security guard?
Security guards decide who enters a building and a cell membrane decides what enters a cell._
List three substances that can easily pass through the cell membrane.
Oxygen, Carbon Dioxide, Water___________________________________________________
Why is the cell membrane considered ‘semi-permeable’?
AM
Not everything is allowed to enter.________________________________________________
Fill in the chart below displaying the three ways a substance can move through a cell membrane.
Method
Particles that pass through
Is energy required?
Direction of flow
Diffusion
Anything
No
HIGH  LOW
Osmosis
Water
No
HIGH  LOW
Anything
Yes
LOW  HIGH
EX
Active Transport
Why do you think active transport requires energy while diffusion and osmosis do not?
It is harder to pull in particles when they are abundant inside the cell and scarce outside the
cell. An area with a high concentration is more likely to want to travel to a low concentration._