Page 37 - 新思维科学学生用书8 样章

1 Respiration

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1.1 The list includes some of the structures that air passes through, as it moves
from outside the body to the place where gas exchange happens.

Write the structures in the correct order.
bronchiole trachea bronchus alveolus (air sac) [2]
1.2 The diagram shows an air sac and a blood capillary.

a Copy the diagram. Label:
• the blood capillary

• the wall of the air sac. [2]
b Draw two red blood cells in the correct place on your diagram. [1]
c Draw an arrow to show the direction in which oxygen diffuses.
Label your arrow O. [1]
d Draw an arrow to show the direction in which carbon dioxide diffuses.

Label your arrow C. [1]
e Describe how the red blood cells transport oxygen to all the cells in the body. [2]
1.3 In each of these groups of statements, only one is correct.

Choose the correct statement, and write down its letter.
a A Every living cell respires.
B Only animal cells respire.
C Respiration uses up energy. [1]
b A Expired (breathed out) air contains only carbon dioxide.

B Expired air contains more carbon dioxide than inspired (breathed in) air.
C Expired air contains more oxygen than inspired air. [1]

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