Starter quiz
- What is the process by which cells release energy?
- 'respiration' ✓
- What are the reactants needed for cellular respiration?
- oxygen ✓
- carbon dioixde
- water
- glucose ✓
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- What gas do red blood cells transport around the body?
- water
- oxygen ✓
- nitrogen
-
Which part of the cell controls what enters and leaves the cell?- cell wall
- cell membrane ✓
- large permanent vacuole
- nucleus
- chloroplast
-
Which statement best describes diffusion?- The net movement of particles from low to high concentration.
- The net movement of particles from high to low concentration. ✓
-
- Which type of blood vessels has a cell wall that is only once cell thick?
- capillaries
- veins
- arteries
-
Exit quiz
- Which small particles move into and out of the blood by diffusion?
- lactic acid
- glucose
- urea ✓
- oxygen ✓
-
- How does water move in and out of the blood?
- 'osmosis' ✓
- Which particles are moved into and out of the blood by active transport?
- glucose ✓
- lactic acid ✓
- amino acids ✓
- Carbon dioxide
- Water
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- True or false? Diffusion occurs down a concentration gradient.
- True ✓
- False
- Which of these processes require energy to take place?
- diffusion
- active transport ✓
- osmosis
-
- Who best describes net movement?
Sofia: The number of particles that move from one area to another.
Sam: The random movement of particles.
Laura: The overall movement of particles. ✓
Worksheet
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Video
Lesson Details
Key learning points
- Particles of substances move into and out of the blood through selectively-permeable cell membranes.
- Oxygen, carbon dioxide and other small particles move into and out of the blood by diffusion.
- Water moves into and out of the blood by osmosis, a type of diffusion.
- The net movement of particles by diffusion and osmosis is down a concentration gradient.
- Large particles are moved into and out of the blood by active transport, which requires energy.
Common misconception
Mistakes with the definitions of diffusion, osmosis and active transport are common, as are their application to biological scenarios.
The definitions are clearly stated and contextualised using key human biological processes and examples.
Keywords
Selectively-permeable membrane - A membrane that will only allow some substances through and not others.
Diffusion - Diffusion is the net movement of particles from an area of higher concentration to an area of lower concentration.
Net movement - The overall movement of particles.
Osmosis - The net movement of water molecules from high to low concentration through a selectively-permeable membrane.
Active transport - The net movement of particles against a concentration gradient using energy.
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