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The Respiratory System

  • 4 subtopics
  • 12 things to know
  • Component 1

What The Respiratory System covers

The Respiratory System is examined in Component 1, Scientific principles of physical education. It covers structure of the airways and alveoli, the mechanics of breathing, gas exchange, partial pressure and diffusion and lung volumes and capacities.

Where it is assessed

Component 1

Scientific principles of physical education, a 2 hour 30 minute paper worth 40% of the qualification.

Check the Pearson Edexcel specification ↗

The 4 subtopics

Each one has its own page.

What you need to know

Answer each one before you reveal it.

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Key term

Why does air move into and out of the lungs?

Key term

Where do external and internal respiration take place, and why does oxygen enter the blood at the lungs?

Key term

What are inspiratory capacity and functional residual capacity, and how is each calculated?

Key term

Name three features that make the alveoli efficient at gas exchange.

Key term

In order, which structures does air pass through between the pharynx and the alveoli?

Key term

Define pulmonary ventilation.

Key term

What is partial pressure?

Key term

Define tidal volume.

Key term

What is the pharynx, and what does it carry?

Key term

Which muscles contract to produce inspiration at rest?

Key term

Define diffusion.

Key term

What is inspiratory reserve volume?

Take The Respiratory System further

The same content, four other ways.

Commonly confused

Pairs that lose marks when they are blurred together.

  • Inspiration vs Expiration

    Inspiration: the movement of air into the lungs. Expiration: the movement of air out of the lungs.

  • External respiration vs Internal respiration

    External respiration: gas exchange between the alveoli and pulmonary blood. Internal respiration: gas exchange between tissue blood and muscle cells.

  • Tidal volume vs Vital capacity

    Tidal volume: the air moved in or out in one normal breath. Vital capacity: the most air exhaled after the deepest possible breath in.

Questions from this topic

Each one with the model answer underneath.

  1. 1

    In order, which structures does air pass through between the pharynx and the alveoli?

    Model answer

    Air passes from the pharynx into the larynx and down the trachea. The air then enters a bronchus, the bronchioles and finally the alveoli.

  2. 2

    What is the pharynx, and what does it carry?

    Model answer

    The pharynx is the throat, the passage behind the nose and mouth. The pharynx carries air towards the larynx and food towards the oesophagus.

  3. 3

    What is the function of the larynx?

    Model answer

    The larynx is the voice box, containing the vocal cords. The epiglottis closes over the larynx during swallowing so food cannot enter the trachea.

  4. 4

    How is the trachea adapted to keep air flowing to the lungs?

    Model answer

    C-shaped rings of cartilage hold the trachea open during breathing. Mucus and ciliated cells trap dust and sweep it away from the lungs.

  5. 5

    What are the bronchi?

    Model answer

    The bronchi are the two branches of the trachea, one entering each lung. Cartilage supports the bronchi and keeps them open.

  6. 6

    How do bronchioles differ from bronchi?

    Model answer

    Bronchioles are much smaller airways that lead from the bronchi towards the alveoli. Bronchioles lack cartilage and have smooth muscle, so they can widen or narrow.

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The Respiratory System revision questions

What does The Respiratory System cover in Edexcel A-Level Physical Education?
4 subtopics: structure of the airways and alveoli, the mechanics of breathing, gas exchange, partial pressure and diffusion and lung volumes and capacities. Each one has its own page with questions and model answers.
How is The Respiratory System organised?
By the Edexcel 9PE0 specification, subtopic by subtopic, so it matches the order you are taught it in.

Every question in The Respiratory System, on a schedule.

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