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Question 6:
(a) Diagram 6.1 shows a gaseous exchange in the alveolus.
Diagram 6.1
Explain how oxygen is transported to the body tissues for cellular respiration. [4 marks]
(b)
![](http://spmbiology.blog.onlinetuition.com.my/wp-content/uploads/sites/20/2019/11/Picture56.png)
Based on the statement above, suggest and explain how to keep our lungs healthy. [6 marks]
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(c) Diagram 6.2.1 and 6.2.2 show the respiratory organ from two different organisms.
![](http://spmbiology.blog.onlinetuition.com.my/wp-content/uploads/sites/20/2019/11/Picture55.png)
Explain similarities and differences in structures of the respiratory organ between the two organisms. [10 marks]
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Answer:
(a)
- Oxygen gas in the alveoli is at higher partial pressure / higher concentration than in blood.
- Oxygen molecules diffuse across epithelium of alveoli and blood capillaries into blood.
- Oxygen binds with haemoglobin in the red blood cells / erythrocytes to form oxyhaemoglobin.
- The oxygenated blood is then transported from the lungs to cells of body tissues.
- In the tissues, oxyhaemoglobin dissociates into oxygen and haemoglobin.
- Oxygen diffuses down a concentration gradient across the epithelia of blood capillaries into the cells of body tissues.
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(b)
![](http://spmbiology.blog.onlinetuition.com.my/wp-content/uploads/sites/20/2019/11/Picture57.png)
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(c)
![](http://spmbiology.blog.onlinetuition.com.my/wp-content/uploads/sites/20/2019/11/Picture58.png)
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![](http://spmbiology.blog.onlinetuition.com.my/wp-content/uploads/sites/20/2019/11/Picture59.png)
(a) Diagram 6.1 shows a gaseous exchange in the alveolus.
![](http://spmbiology.blog.onlinetuition.com.my/wp-content/uploads/sites/20/2019/11/Picture54-1.png)
Explain how oxygen is transported to the body tissues for cellular respiration. [4 marks]
(b)
![](http://spmbiology.blog.onlinetuition.com.my/wp-content/uploads/sites/20/2019/11/Picture56.png)
Based on the statement above, suggest and explain how to keep our lungs healthy. [6 marks]
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(c) Diagram 6.2.1 and 6.2.2 show the respiratory organ from two different organisms.
![](http://spmbiology.blog.onlinetuition.com.my/wp-content/uploads/sites/20/2019/11/Picture55.png)
Explain similarities and differences in structures of the respiratory organ between the two organisms. [10 marks]
[adinserter block="3"]
Answer:
(a)
- Oxygen gas in the alveoli is at higher partial pressure / higher concentration than in blood.
- Oxygen molecules diffuse across epithelium of alveoli and blood capillaries into blood.
- Oxygen binds with haemoglobin in the red blood cells / erythrocytes to form oxyhaemoglobin.
- The oxygenated blood is then transported from the lungs to cells of body tissues.
- In the tissues, oxyhaemoglobin dissociates into oxygen and haemoglobin.
- Oxygen diffuses down a concentration gradient across the epithelia of blood capillaries into the cells of body tissues.
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(b)
![](http://spmbiology.blog.onlinetuition.com.my/wp-content/uploads/sites/20/2019/11/Picture57.png)
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(c)
![](http://spmbiology.blog.onlinetuition.com.my/wp-content/uploads/sites/20/2019/11/Picture58.png)
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![](http://spmbiology.blog.onlinetuition.com.my/wp-content/uploads/sites/20/2019/11/Picture59.png)