1.2 Gas exchange
1.2 Gas exchange Exercise 1 Using connecting words
PL E
In this exercise, you choose the best connecting word to complete sentences about gas exchange.
Look at Connecting words in the English skills and support section for information about connecting words.
Choose a connecting word to complete each sentence. Choose from the following words. Use each word at least once. and because but so a
Oxygen can easily diffuse from the alveoli into the capillaries ........................... they are very close together.
b
Carbon dioxide is produced in all the cells in the body by respiration,
M
.......................... expired air contains more carbon dioxide than inspired air. A large volume of air passes through the trachea, ....................... gas exchange does not happen there.
d
Gas exchange is the movement of oxygen into the blood ......................... the movement of carbon dioxide out of the blood.
SA
c
e
An analogy is a comparison between one thing and another, ............... the two things are not exactly the same.
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