Good Learning Co.
SavannahYear 8
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ScienceHow animal bodies work30 min★★★ difficulty

Aerobic and anaerobic respiration: the sprint and the marathon

A cheetah can hold top speed for around twenty seconds. A wolf can trot for hours. The difference is which respiration pathway is paying for the movement.

Lesson overview

What you'll learn in this lesson

Understand aerobic and anaerobic respiration in living organisms, including the breakdown of organic molecules to enable all the other chemical processes necessary for life

Key learning points

  • • Respiration is not breathing
  • • When oxygen runs short
  • • Sprinters and stayers
  • • Why the pathway matters for survival

This lesson at a glance

  • 30 minutes
  • 19 parts to scroll through
  • 4 quick checks
  • Marked quiz at the end
  • Gentle pace: short sittings with pauses

Words to know

aerobicanaerobicrespirationlivingorganisms

Scroll down — the lesson carries on below

Part 1 of 19 · Discover5%
1

Watch & discover

Part 1 of 19

Watch first

Aerobic and anaerobic respiration: the sprint and the marathon

An English teaching video on this topic from Little School. Watch it, then scroll down for the lesson.

In a nutshell

Understand aerobic and anaerobic respiration in living organisms, including the breakdown of organic molecules to enable all the other chemical processes necessary for life

2

What you already know

Part 2 of 19

Before we start

What you already know

You should already know that respiration releases energy from glucose in every living cell, and that breathing supplies oxygen.

3

Key words

Part 3 of 19

Key words

Words you'll need today

Aerobic respiration
Releasing energy from glucose using oxygen.
Anaerobic respiration
Releasing energy from glucose without oxygen, producing lactic acid in animals.
Oxygen debt
The extra oxygen needed after exercise to deal with lactic acid.
Mitochondria
Structures in cells where aerobic respiration happens.
Stamina
The ability to keep working aerobically for a long time.
4

Learning cycle

Part 4 of 19

Learning cycle 1 of 2

Two ways to pay for movement

A short piece of teaching, then a check to make sure it has landed.

5

Explore the idea

Part 5 of 19

Learn

Respiration is not breathing

Breathing moves air. Respiration is the chemical release of energy in cells. Aerobic respiration is summarised as glucose + oxygen → carbon dioxide + water, and it happens in mitochondria. The energy released drives muscle contraction, growth, repair and every other process that keeps an animal alive.

6

Explore the idea

Part 6 of 19

Learn

When oxygen runs short

If muscles need energy faster than oxygen arrives, they respire anaerobically: glucose → lactic acid. It is fast but releases far less energy per glucose molecule and builds up lactic acid, causing fatigue. Afterwards the animal breathes hard to repay the oxygen debt.

7

Quick check

Part 7 of 19

Quick check

Aerobic respiration produces

8

Quick check

Part 8 of 19

Quick check

Anaerobic respiration in animal muscle produces

9

Reset break

Part 9 of 19

Pause

That's sitting 1 of 2 done

Stretch, get a drink, look out of the window. There is no timer and nothing is counting down — your place is saved, so you can come back in five minutes or tomorrow.

Stop here for now
10

Learning cycle

Part 10 of 19

Learning cycle 2 of 2

Predicting hunting styles

A short piece of teaching, then a check to make sure it has landed.

11

Explore the idea

Part 11 of 19

Learn

Sprinters and stayers

Cheetahs and domestic cats rely heavily on anaerobic bursts, so a failed chase must end quickly. Wolves, wildebeest and humans have high aerobic capacity — many mitochondria, large lungs and efficient circulation — so they cover distance instead. Neither is better; each suits a hunting or escape strategy.

12

Explore the idea

Part 12 of 19

Learn

Why the pathway matters for survival

A cheetah that chases too long overheats and must rest, which is when other predators steal the kill. Wolves solve the same problem by taking turns and wearing prey down. Physiology sets the tactics, and tactics decide who eats.

13

Quick check

Part 13 of 19

Quick check

Why can a cheetah only sprint for a short time?

14

Quick check

Part 14 of 19

Quick check

A wolf's hunting style depends on high

15

Common mix-ups

Part 15 of 19

Common mix-ups

Things people often get wrong

  • Breathing and respiration are different processes.
  • Anaerobic respiration releases less energy per glucose molecule, not more — it is just faster to start.
  • Lactic acid causes fatigue; it is not a poison that kills muscle.
16

Challenge round

Part 16 of 19

Game · Sort it

Which of these are true?

Drag each card into the right column. Tap a card first if dragging is fiddly.

True

Not true

17

Challenge round

Part 17 of 19

Game · Fill the gaps

Finish the sentences

Choose the word that belongs in each gap.

____ is the chemical release of energy in cells.

____ respiration is summarised as glucose + oxygen → carbon dioxide + water, and it happens in mitochondria.

Cheetahs and domestic cats rely heavily on ____ bursts, so a failed chase must end quickly.

18

Mastery quiz

Part 18 of 19

Marked quiz

End of lesson quiz: Aerobic and anaerobic respiration: the sprint and the marathon

6 questions, marked with the reasoning shown. No timer.

  1. 1. Aerobic respiration happens mainly in

  2. 2. Oxygen debt is repaid by

  3. 3. Which releases more energy per glucose molecule?

  4. 4. Respiration supplies energy for

  5. 5. Many mitochondria in muscle suggest an animal is adapted for

  6. 6. A failed cheetah chase must end quickly because

19

Lesson round-up

Part 19 of 19

Lesson round-up

Ready when you are

Quiz score

Not sat

Games

Not played

Points this lesson

0

Best run

0 in a row

Luna: 0 out of 4 on the practice checks. Only if you feel up to it — one more?

Ask Luna

Do the work

Your written work for this lesson

This is the part you'd do in your book at school. Pick the pieces below, write here or on paper, and photograph anything you draw or work out.

Case study

Why the school greenhouse failed

A science club grew tomato plants in the school greenhouse. In June the plants grew well: leaves were dark green and the fruit set quickly. In July the club went away for two weeks and left the greenhouse door shut. When they came back, the leaves were curled and pale and most of the fruit had dropped.

The club had a data logger inside. It showed the temperature reached 46 °C on several afternoons and the soil moisture fell close to zero. The club knew photosynthesis needs light, water and carbon dioxide, and that enzymes in a plant work best in a narrow range of temperature. Above that range the enzymes stop working properly.

The club repeated the summer with the door propped open and a water bottle drip on each pot. Temperature peaked at 31 °C and the plants survived.

Written for Good Learning Co.

Reading questions

  1. Name the variable the club changed the second time, and one variable they kept the same.
  2. Explain, using the words photosynthesis and enzymes, why the plants were damaged in July.
  3. Write a conclusion for the club's report, saying how far the evidence supports it.

  • Method and results

    Writing

    Write the aim, what you changed, what you measured and what you kept the same, then record your results in a table.

    1 page + results table

  • Conclusion

    Writing

    Explain what your results show and why, using the scientific words from the lesson. Say how you know you can trust them.

    6–8 sentences

  • Labelled diagram

    Diagram

    Draw the apparatus or the process in pencil, label it fully, and photograph it.

    1 labelled diagram

  • Reading and notes

    Reading

    Read the lesson text again and write the key ideas in your own words.

    Half a page of notes

Saved as you type.

Part 1 of 19 · Watch & discover

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