Breathing, Respiration and Gas Exchange › Revision notes
Breathing, Respiration and Gas Exchange — Revision notes
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Quick recap
5 clipsShort clips from the lesson video. Watch a couple to jog your memory, then try the Brain dump below.
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Brain dump
Before you look at anything else, write down everything you can remember about this lesson: key words, facts, examples. Spelling doesn't matter. Then see which of the 10 key terms you remembered.
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Ones you missed. Read these, then try again tomorrow:
Key terms
- Breathing
- The process in which air moves in and out of the lungs
- Lungs
- A pair of organs in the chest — the only place breathing happens
- Nitrogen
- A gas that makes up 78% of air and your body does nothing with
- Oxygen
- Only about 21% of air
- Carbon Dioxide
- A waste product of cellular respiration, removed by breathing out
- Mitochondria
- Subcellular structures where cellular respiration takes place
- Cellular Respiration
- A chemical process using sugar and oxygen to provide energy for life processes
- Air Sacs
- Tiny structures at the end of lung tubes where gas exchange happens
- Gas Exchange
- Oxygen diffuses from lungs into blood; carbon dioxide diffuses from blood into lungs
- Diffusion
- Particles spreading from an area of high concentration to an area of low concentration
TERM — tap to reveal
What this lesson covers
How well do you know each one? Be honest: red means go back over it.
- Describe what air is made of and explain why nitrogen plays no part in breathing
- Define breathing and describe how air moves in and out of the lungs
- Explain what gas exchange is and where in the body it happens
- Explain what cellular respiration is and why it happens in mitochondria
- Compare breathing, gas exchange and respiration and say where each takes place
- Explain how exhaled air differs from inhaled air, and why rescue breaths work
Test yourself
Cover the answer, say it out loud, then check the full quiz on the lesson page.
- Which gas makes up most of the air you breathe in?
- Which of these does NOT happen during gas exchange?
- A candle burns out faster in exhaled air. Why?
Topic quiz
13 questions on this topic only — not mixed with anything else, one at a time.
Question 1 of 13
Score: 0 out of 13
Spelling challenge
Read the definition, then type the correct spelling of the term. Uses the same terms as above.
Score: 0/0