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Form 3 Science Chapter 1
FORM 3 CHAPTER 1RESPIRATORY SYSTEM
1. Diagram 1 shows part of the human respiratory system.
(a) Label P, Q and R on Diagram 1 with the following words.
Lung Diaphragm Trachea
[3 marks]
(b) The sequence shows the flow of inhaled air in the respiratory system.
Trachea Z bronchiole alveolus
Label Z on Diagram 1.[1 mark]
(c) The movement of S causes the thoracic cavity to expand during inhalation. How does S move during inhalation?
………………………………………………………………………………………………………
[1 mark]
138
S
P: …………………………….
Q: …………………………….
R: …………………………….
Diagram 1
S
Form 3 Science Chapter 1
2. Diagram 2 shows the gaseous exchange in an alveolus.
(a) Identify the gases labelled P and Q.
Gas P: …………………………………….. Gas Q: ……………………………………………..
[2 marks]
(b) Name the process involved in the gaseous exchange in the alveolus.
……………………………………………………………………………………………………….
[1 mark]
(c) What causes gas P to diffuse into the bloodstream?
……………………………………………………………………………………………………….
……………………………………………………………………………………………………….
[1 mark]
(d) What happens to gas P as it enters the blood capillary?
……………………………………………………………………………………………………….
[1 mark]
(e) State one difference between blood X and blood Y.
……………………………………………………………………………………………………….
……………………………………………………………………………………………………….
[1 mark]
139
DIagram 2
Form 3 Science Chapter 1
3. Diagram 3 shows a model of the respiratory system.
(a) What do the balloon and rubber sheet represent?
(i) Balloon: ………………………………………………………………………………………
(ii) Rubber sheet: ……………………………………………………………………………….
[2 marks]
(b) (i) What happens when the rubber sheet is pulled downwards?
……………………………………………………………………………………………………
[1 mark]
(ii) Explain your answer in (b). ……………………………………………………………………………………………………
……………………………………………………………………………………………………
[2 marks]
(c) Name the process that is shown by activity (b)(i).
………………………………………………………………………………………………………
[1 mark]
140
Rubber sheet
Stopper
Glass tube
Balloon
Diagram 3
Form 3 Science Chapter 1
4. Diagram 4 shows an activity to show the effect of cigarette smoke on the lungs.
(a) What are the changes to the following at the end of the activity?
(i) The temperature: …………………………………………………………………………….
(ii) The white cotton wool: ……………………………………………………………………….
(iii) The hydrogen carbonate indicator: …………………………………………………………
[3 marks]
(b) State one inference based on the observation in (a)(iii). ………………………………………………………………………………………………………
[1 mark]
(c) Name one harmful substance found in cigarette smoke.
………………………………………………………………………………………………………
[1 mark]
(d) Suggest one good habit that can help to improve the quality of air around us.
………………………………………………………………………………………………………
[1 mark]
141
Diagram 4
Form 3 Science Chapter 1
5. Diagram 5 shows a process that takes place in the human respiratory system.
(a) Name the process shown in Diagram 5.
……………………………………………………………………………………………………
[1 mark]
(b) Describe the movement of the following parts during this process.
(i) Ribs: ………………………………………………………………………………………….
(ii) Diaphragm: ………………………………………………………………………………….
[2 marks]
(c) Explain briefly how air is forced into the lungs.
………………………………………………………………………………………………………
………………………………………………………………………………………………………
[2 marks]
(d) Complete the sequence to show the flow of air into the lungs during this process.
[2 marks]
142
Diagram 5
Nasal cavity Bronchus
Alveolus