Fig． 5.1 shows part of the human gas exchange system． Fig． 5.1 The composition of air changes between inspiration and expiration. (i) Complete the table about how expired air differs from inspired air. Choose the word or phrase from the list. Each word or phrase may be used once, more than once or not at all. (ii) State the name of the substance used to test for the presence of carbon dioxide gas. .................................................................................................................................

Biology

IGCSE&ALevel

CAIE

Exam No：0610_w24_qp_31 Year：2024 Question No：5(c)

Answer:

Knowledge points:

11.1.1 List the features of gas exchange surfaces in humans, limited to large surface area, thin surface, good blood supply and good ventilation with air

11.1.10 Explain the role of goblet cells, mucus and ciliated cells in protecting the gas exchange system from pathogens and particles

11.1.2 Name and identify the lungs, diaphragm, ribs, intercostal muscles, larynx, trachea, bronchi, bronchioles, alveoli and associated capillaries

11.1.3 State the differences in composition between inspired and expired air, limited to oxygen, carbon dioxide and water vapour Use limewater as a test for carbon dioxide to investigate the differences in composition between inspired and expired air

11.1.4 Investigate and describe the effects of physical activity on rate and depth of breathing

11.1.5 Name and identify the internal and external intercostal muscles

11.1.6 State the functions of the cartilage in the trachea

11.1.7 Explain the role of the ribs, the internal and external intercostal muscles and the diaphragm in producing volume and pressure changes in the thorax leading to the ventilation of the lungs

11.1.8 Explain the differences in composition between inspired and expired air

11.1.9 Explain the link between physical activity and rate and depth of breathing in terms of the increased carbon dioxide concentration in the blood, detected by the brain, causing an increased rate of breathing

Answer:

Knowledge points:

Solution:

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