The diagram shows microscopic detail from a human lung - Leaving Cert Biology - Question c - 2009
Question c
The diagram shows microscopic detail from a human lung.
(i) Name the parts labelled A, B and C.
(ii) Give two features of the structures in the diagram that allow ... show full transcript
Worked Solution & Example Answer:The diagram shows microscopic detail from a human lung - Leaving Cert Biology - Question c - 2009
Step 1
Name the parts labelled A, B and C.
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Answer
A = Bronchiole
B = Alveolus
C = Arteriole or Capillary
Step 2
Give two features of the structures in the diagram that allow for efficient gas exchange.
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Answer
The walls of the alveoli and capillaries are thin, facilitating quick diffusion of gases.
There is a large surface area due to a vast number of alveoli, allowing greater gas exchange.
Step 3
Name a disorder of the breathing system and say how it may be:
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Answer
Named disorder: Asthma
Cause: Asthma can be caused by allergic reactions or environmental factors such as pollution.
Prevention: Avoiding known triggers like allergens and using medication can help prevent asthma attacks.
Treatment: Treatment often involves using inhalers that contain bronchodilators to open the airways.
Step 4
Which gas, dissolved in the blood, can trigger deeper or faster breathing?
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Answer
The gas that triggers deeper or faster breathing is carbon dioxide (CO2).
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