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Adaptations of the human lungs for gas exchange

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Lesson details

Lesson outcome

Waxaan sharxi karaa sida sambabada aadanaha loo laqabsiiyay si ay u kordhiyaan xadiga is-weydaarsiga gaaska.

Introduction

In this lesson: I can describe how the human lungs are adapted to increase the amount of gas exchange. The lungs are made up of tiny air sacs called alveoli. Gas exchange takes place between air in alveoli and blood in capillaries.

Show transcript
The lungs are made up of tiny air sacs called alveoli. Gas exchange takes place between air in alveoli and blood in capillaries. There are millions of alveoli to increase the surface area of the lungs for gas exchange. The walls of the alveoli are one cell thick to create a short diffusion distance for gas exchange. The alveoli are surrounded by capillaries carrying blood, to maintain a concentration gradient for gas exchange.

Worksheet

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Quizzes

  1. 1. Select the option which correctly finishes the sentence: Gas exchange is the process of…

    • …air moving in and out of the lungs by inhaling and exhaling.
    • …using sugar and oxygen to provide energy for life processes.
    • Correct answer:…oxygen and carbon dioxide diffusing between the lungs and the blood.

  2. 2. The diagram shows the human gas exchange system. Which letter on the diagram represents the bronchioles?

    • A
    • Correct answer:B
    • C
    • D
    • E

  3. 3. The diagram shows the human gas exchange system. Which letter on the diagram represents the alveoli?

    • A
    • B
    • Correct answer:C
    • D
    • E

  4. 4. In diffusion, the net movement of particles is...

    • Correct answer:...from areas of high concentration to low concentration.
    • ...from areas of low concentration to high concentration.
    • ...between areas of equal concentration.

  5. 5. Which of the following are features of diffusion?

    • Correct answer:The particles are randomly moving.
    • It requires energy from respiration.
    • Correct answer:It is a passive process.
    • Once the particles are evenly spread they stop moving.

  1. 1. What level of organisation are alveoli?

    • organ
    • cell
    • Correct answer:tissue
    • organ system
    • molecule

  2. 2. Select the option which correctly finishes the sentence: the walls of the alveoli are one cell thick in order to…

    • Correct answer:create a short diffusion distance for oxygen and carbon dioxide to be exchanged.
    • increase the surface area of the lungs for gas exchange.
    • maintain the concentration gradient between the alveoli and the capillary.

What pupils see

The same lesson as a pupil sees it. You can set any section as work on its own.

  • IntroductionPrepare
  • Starter quizActivate · 5 questions
  • Lesson videoLearn
  • Exit quizCheck · 2 questions
This content is by Cashar and published under an open licence.