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The diagram shows microscopic detail of an alveolus and a capillary from the human lung - Leaving Cert Biology - Question 6 - 2019
Question 6
The diagram shows microscopic detail of an alveolus and a capillary from the human lung. (a) Name the blood vessel from which the capillary arises. (b) Give any th... show full transcript
Worked Solution & Example Answer:The diagram shows microscopic detail of an alveolus and a capillary from the human lung - Leaving Cert Biology - Question 6 - 2019
Step 1
Step 2
Give any three features of alveoli or their capillaries that allow for efficient gas exchange.
Answer
- The membrane (or wall) of the alveoli is thin (only one cell thick), allowing for efficient diffusion of gases.
- They have a large surface area, which increases the area available for gas exchange.
- The alveoli and capillaries are present in large numbers, providing extensive contact for gas exchange.
Step 3
Name a disorder of the human breathing system and suggest how it is caused and treated.
Answer
Asthma
- Cause: Triggers such as pet dander, allergens, smoke, or dust can provoke asthma symptoms.
- Treatment: Using an inhaler (bronchodilator) can help in relieving symptoms. Other treatments may include corticosteroids or anti-inflammatory medications.