YV4-cells-diffusion

Cells & Osmosis
Diffusion
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Cells & Osmosis
Diffusion

Slide 1 - Diapositive

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Slide 2 - Diapositive

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Describe what happens in the video

Slide 3 - Carte mentale

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Diffusion
  • Molecules move from a high to a low concentration
  • The movement of molecules is random
  • This is a form of passive transport, because the energy comes from the molecules themselves

Slide 4 - Diapositive

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Slide 5 - Diapositive

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Try to describe what happens using this new information

Slide 6 - Carte mentale

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Slide 7 - Diapositive

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How does heat affect diffusion?
A
It has no effect
B
More heat means faster diffusion
C
More heat means slower diffusion

Slide 8 - Quiz

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What is the effect of distance on diffusion?

Slide 9 - Diapositive

The shorter the distance, the faster the molecules will have equal concentrations throughout the space
What is the effect of surface area on diffusion?

Slide 10 - Diapositive

The bigger the surface area, the faster the molecules will be evenly distributed over the available area
What is the effect of concentration gradient on diffusion?

Slide 11 - Diapositive

The bigger the difference in concentration, the faster diffusion will happen
Misconceptions with diffusion
  • Molecules want the concentration to be equal/ try to make the concentrations equal. Molecules have no mind to think with, they move randomly
  • Molecules stop moving after the concentrations are equal. Molecules never stop moving, but when concentrations are equal there are equal amounts of molecules moving in every direction.

Slide 12 - Diapositive

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What is diffusion?
A
The movement of particles from low concentration to high concentration.
B
The movement of particles from high concentration to low concentration.
C
Active movement of particles, requiring energy from respiration.

Slide 13 - Quiz

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Which process is responsible for gas exchange in the lungs?
A
Diffusion
B
Osmosis
C
Active transport

Slide 14 - Quiz

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What happens to the rate of diffusion as the temperature increases?
A
It decreases
B
It stays the same
C
It increases

Slide 15 - Quiz

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What happens to the rate of diffusion as the surface area increases?
A
It increases
B
It decreases
C
It stays the same

Slide 16 - Quiz

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What have multi-celled organisms developed in order to provide an increased surface area for gas exchange?
A
A nervous system.
B
A circulatory system.
C
An excretory system.

Slide 17 - Quiz

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Why do large multicellular organisms need transport systems while simple unicellular organisms do not?
A
Large organisms have a much smaller surface area to volume ratio compared to smaller ones.
B
Diffusion does not work in large multicellular organisms.
C
Unicellular organisms have a much smaller surface area to volume ratio than multicellular organisms.

Slide 18 - Quiz

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Learning Objective
- You can explain the process of diffusion.

Slide 19 - Diapositive

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