CCEA A-Level Health and Social Care 0003
Promoting Quality Care
Communication in Health, Social Care and Early Years Settings
Health and Well-Being
Safeguarding Children
Adult Service Users
Holistic Therapies
Understanding the Physiology of Health and Illness
Applied Research
Body Systems and Physiological Disorders
Providing Services
Public Health and Health Promotion
Supporting the Family
Understanding Human Behaviour
Human Nutrition and Health
Body Systems and Physiological Disorders
The respiratory system, ventilation and gas exchange
- 3 things to know
- A2 2
Overview
How mucus and cilia protect the lungs, function of the pleural membranes and what happens to the diaphragm and ribcage during inspiration.
What you need to know
Answer each one before you reveal it.
Why is the trachea supported by rings of cartilage?
Describe how mucus and cilia protect the lungs.
Questions from this subtopic
Each one with the model answer underneath.
- 1
Trace the path air takes from the mouth to the site of gas exchange.
Model answer
Air passes from the nose or mouth into the trachea, then along the bronchi and the bronchioles and finally into the alveoli.
- 2
Why is the trachea supported by rings of cartilage?
Model answer
Rings of cartilage hold the trachea open so that it cannot collapse when the pressure inside the airway falls during inhalation.
- 3
Describe how mucus and cilia protect the lungs.
Model answer
Goblet cells produce mucus that traps dust and microorganisms, and ciliated cells sweep the mucus up the airway to be swallowed.
- 4
What are the alveoli, and what happens there?
Model answer
The alveoli are microscopic air sacs in which oxygen passes into the blood and carbon dioxide passes out of it.
- 5
Give four ways an alveolus is adapted for efficient gas exchange.
Model answer
An alveolus has a very large total surface area, a wall one cell thick, a moist lining and a dense capillary network around it.
- 6
Explain the direction in which oxygen and carbon dioxide diffuse at an alveolus.
Model answer
Oxygen diffuses from the alveolar air, where its concentration is higher, into the blood, and carbon dioxide diffuses from the blood into the air.
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