2016年12月17日 星期六

F2 IS QZ 08 anwers

Label Diagram (7 marks)
Label the diagram below which shows you the structure of the human breathing system: (7)

Fill in the Blanks (9 marks)
1    When we breathe in, the intercostal muscles (1) contract, leading to upwards and outwards (1) movement of the ribs. At the same time, the diaphragm (1) becomes flattened. This actions increases (1) the volume inside the chest and decreases / reduces (1) the gas pressure inside. Therefore, air flows in / moves in / is drawn into (1) the lungs.

2     In humans, gaseous exchange occurs in the air sacs (1) of the lungs. In there, oxygen enters the blood (1) from the air while carbon dioxide (1) leaves the blood to air.


Multiple Choice (5 marks)
Circle the letter of the best answer for each question.
Directions: The diagram on the next page shows a model used to demonstrate the action of the diaphragm in breathing. Refer to the diagram and answer questions 1 and 2.
1.      Which of the following shows the parts of the respiratory system that the model represents?

Glass tube
Y-shaped tube
Bell jar
Rubber sheet
A.
Chest wall
Diaphragm
Trachea
Bronchus
B.
Diaphragm
Trachea
Bronchus
Chest wall
C.
Bronchus
Chest wall
Diaphragm
Trachea
D.
Trachea
Bronchus
Chest wall
Diaphragm

2.      What will happen when we push the rubber sheet upwards?
(I)   The balloons become larger.
(II)  The balloons become smaller.
(III)        The gas pressure inside the bell jar increases.
(IV)        The gas pressure inside the bell jar decreases.
A.   (I) and (III)             B.    (I) and (IV)             C.   (II) and (III)       D.    (II) and (IV)

Direction: The following diagram shows a model to simulate the action of the intercostal muscles during breathing. Refer to the diagram and answer questions 3 and 4.
3.      Which of the following about the structures represented by bars A and B is correct?

Bar A
Bar B
A.
Rib
Intercostal muscle
B.
Rib
Backbone
C.
Backbone
Intercostal muscle
D.
Backbone
Rib

4.      Which of the following is simulated in position X?

Intercostal muscles
State of breathing
A.
Contracts
Breathing out
B.
Contracts
Breathing in
C.
Relaxes
Breathing out
D.
Relaxes
Breathing in

5.      What happens to the oxygen and carbon dioxide contents in the blood after passing through the lungs?

Oxygen
Carbon dioxide
A.
Increases
Increases
B.
Increases
Decreases
C.
Decreases
Increases
D.
Decreases
Decreases

Challenging Questions (Bonus 2 marks)
Draw a flow chart to show the sequence of air flow during breathing out.
air sac => small tubes => bronchi => trachea => Nose / mouth

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