New
New
Year 10
OCR
Foundation

Moving into and out of the blood: diffusion, osmosis and active transport

I can explain how particles of substances move into and out of the blood by diffusion, osmosis and active transport.

New
New
Year 10
OCR
Foundation

Moving into and out of the blood: diffusion, osmosis and active transport

I can explain how particles of substances move into and out of the blood by diffusion, osmosis and active transport.

Lesson details

Key learning points

  1. Particles of substances move into and out of the blood through selectively-permeable cell membranes.
  2. Oxygen, carbon dioxide and other small particles move into and out of the blood by diffusion.
  3. Water moves into and out of the blood by osmosis, a type of diffusion.
  4. The net movement of particles by diffusion and osmosis is down a concentration gradient.
  5. 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.

Use models and simulations to quickly demonstrate the processes of diffusion, osmosis and active transport. Spend time highlighting the important distinctions between each process, and be prepared to thin out the explanations in the lesson to suit the specification and the class.
Teacher tip

Equipment

None required.

Licence

This content is © Oak National Academy Limited (2024), licensed on Open Government Licence version 3.0 except where otherwise stated. See Oak's terms & conditions (Collection 2).

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6 Questions

Q1.
What is the process by which cells release energy?
Correct Answer: respiration, cellular respiration, aerobic respiration, anaerobic respiration
Q2.
What are the reactants needed for cellular respiration?
Correct answer: oxygen
carbon dioixde
water
Correct answer: glucose
Q3.
What gas do red blood cells transport around the body?
water
Correct answer: oxygen
nitrogen
Q4.
Which part of the cell controls what enters and leaves the cell?
An image in a quiz
cell wall
Correct answer: cell membrane
large permanent vacuole
nucleus
chloroplast
Q5.
Which statement best describes diffusion?
An image in a quiz
The net movement of particles from low to high concentration.
Correct answer: The net movement of particles from high to low concentration.
Q6.
Which type of blood vessels has a cell wall that is only once cell thick?
capillaries
veins
arteries

6 Questions

Q1.
Which small particles move into and out of the blood by diffusion?
lactic acid
glucose
Correct answer: urea
Correct answer: oxygen
Q2.
How does water move in and out of the blood?
Correct Answer: osmosis
Q3.
Which particles are moved into and out of the blood by active transport?
Correct answer: glucose
Correct answer: lactic acid
Correct answer: amino acids
Carbon dioxide
Water
Q4.
True or false? Diffusion occurs down a concentration gradient.
Correct answer: true
false
Q5.
Which of these processes require energy to take place?
diffusion
Correct answer: active transport
osmosis
Q6.
Who best describes net movement?
Sofia: The number of particles that move from one area to another.
Sam: The random movement of particles.
Correct answer: Laura: The overall movement of particles.