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Body Systems and Physiological Disorders

Behaviour that protects the heart and lungs

  • 3 things to know
  • A2 2

Overview

Two conditions that make up chronic obstructive pulmonary disease, united Kingdom guideline for low-risk alcohol consumption and body mass index bands used for adults.

What you need to know

Answer each one before you reveal it.

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Key term

State the body mass index bands used for adults.

Evaluation

Give two limitations of body mass index as a measure.

Key term

How does carbon monoxide in tobacco smoke affect the circulatory system?

Questions from this subtopic

Each one with the model answer underneath.

  1. 1

    How does carbon monoxide in tobacco smoke affect the circulatory system?

    Model answer

    Carbon monoxide binds to haemoglobin in place of oxygen, so less oxygen reaches the tissues and the heart must work harder to compensate.

  2. 2

    What effect does nicotine have on the heart and blood vessels?

    Model answer

    Nicotine raises heart rate and narrows blood vessels, which pushes up blood pressure and makes a clot more likely to form.

  3. 3

    How does tar in tobacco smoke damage the airways?

    Model answer

    Tar paralyses and destroys the cilia lining the airways, so mucus and trapped particles collect in the lungs and infection becomes far more likely.

  4. 4

    Name the two conditions that make up chronic obstructive pulmonary disease.

    Model answer

    Chronic obstructive pulmonary disease covers chronic bronchitis and emphysema, and smoking is by far its most common cause.

  5. 5

    What happens to the lungs in emphysema?

    Model answer

    In emphysema the walls between the alveoli break down into fewer, larger spaces, cutting the surface area for gas exchange and leaving the person breathless.

  6. 6

    What happens to the airways in chronic bronchitis?

    Model answer

    In chronic bronchitis the airways are permanently inflamed and produce excess mucus, causing a persistent cough and repeated chest infections.

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