9. Human gas exchange
A section of Biology, 5090
Listing 10 of 153 questions
The diagram shows apparatus used to study breathing. pen tube to mouthpiece air to and from person substance M upper box containing air revolving drum water Describe what will happen to the upper box containing air as a person takes one breath in from the apparatus. State the percentage of oxygen in atmospheric air. % Explain how the percentage of oxygen in the air in the upper box will change as a person breathes in and out through the apparatus several times. Substance M is present in the apparatus to absorb an excretory product from expired air. Name this excretory product. The diagram shows a chart recorded by the pen on the revolving drum. This chart was recorded for a period of one minute by a person at rest. time / seconds volume of air / dm3 N Explain how the action of one named muscle caused the part of the chart labelled N. A second chart was recorded for a period of one minute by the same person after vigorous exercise. State how an increased rate of breathing after exercise would be shown on this second chart.
5090_s22_qp_22
THEORY
2022
Paper 2, Variant 2
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Table 1.1 lists three of the gases present in the atmosphere. Table 1.1 gas percentage oxygen carbon dioxide nitrogen Complete Table 1.1 to state the percentage of each gas in the atmosphere. Some foods are packaged in a sealed container that contains a mixture of the same gases, with percentages that are different from those found in atmospheric air. shows a diagram of food packaged in this way. mixture of gases sealed container food This method of food packaging slows down decomposition of the food. Suggest how the percentage of one gas named in Table 1.1 is changed when used to package food in this way. Explain how this change will slow down decomposition of the food. Suggest two advantages of slowing down decomposition of packaged food.
5090_s23_qp_22
THEORY
2023
Paper 2, Variant 2
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The lungs are part of the human gas exchange system. Breathing moves air into and out of the lungs. shows parts of the human gas exchange system and their functions. On , draw a line from each part to its function. One has already been done for you. part function intercostal muscles goblet cells alveoli cilia trachea exchange gases remove pathogens carry air to bronchi change volume of thorax release mucus State two features of alveoli that make them suitable for gas exchange. Gas exchange changes the percentages of some gases in the lungs. The pie charts in show how the percentages of gases in the lungs change during one breath. Complete the pie chart titles and the key which shows which gases are represented by different types of shading. air air key other gases
5090_s24_qp_21
THEORY
2024
Paper 2, Variant 1
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Questions Discovered
153