1.When breathing out, which changes occur in the volume of the thorax, the rib cage and the diaphragm?



2.Which feature of alveoli decreases the distance over which oxygen and carbon dioxide molecules diffuse?


3.The composition of inhaled air and exhaled air is different.Which analysis is correct?



4.The table shows the composition of inspired and expired air.



5.The diagram illustrates changes in air pressure taking place inside the lungs during a complete cycle of breathing.Which position on the graph corresponds to the point at which the ribs are beginning to be raised?



6.The diagram shows the lungs.


Which structures contain muscles that contract when breathing in?


7.The diagram shows a transverse section of a leaf.


Which cells absorb carbon dioxide?


8.Which process does not depend on respiration?



9.A dish is filled with agar jelly containing protein. Four holes are cut in the jelly and each hole is filled as shown. Pepsin is a protease found in the stomach.After 30 minutes, which hole will be surrounded by the largest area without protein?



10.The small intestine of a person contains a low concentration of glucose produced from the digestion of starch.Glucose is taken up by the cells of the villi.How does the glucose move?


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