Scientists compared the density of goblet cells in the lungs and the density of mucus in the lungs of three groups of people: - people who do not smoke and do not have lung disease - people who smoke tobacco but do not have lung disease - people who smoke tobacco and have lung disease. The results are shown in the table. What is indicated by these data? 1 There is a positive correlation (relationship) between density of goblet cells and density of mucus. 2 Lung disease results in an increase in goblet cell density. 3 There is an association between tobacco smoking and an increase in mucus density.

1, 2 and 3

1 and 2 only

1 and 3 only

2 and 3 only

Biology

IGCSE&ALevel

CAIE

Exam No：9700_s24_qp_12 Year：2024 Question No：34

Answer:

Knowledge points:

9.1.1.1 lungs

9.1.1.2 trachea

9.1.1.3 bronchi

9.1.1.4 bronchioles

9.1.1.5 alveoli

9.1.1.6 capillary network

9.1.2 describe the distribution in the gas exchange system of cartilage, ciliated epithelium, goblet cells, squamous epithelium of alveoli, smooth muscle and capillaries

9.1.3 recognise cartilage, ciliated epithelium, goblet cells, squamous epithelium of alveoli, smooth muscle and capillaries in microscope slides, photomicrographs and electron micrographs

9.1.4 recognise trachea, bronchi, bronchioles and alveoli in microscope slides, photomicrographs and electron micrographs and make plan diagrams of transverse sections of the walls of the trachea and bronchus

9.1.5 describe the functions of ciliated epithelial cells, goblet cells and mucous glands in maintaining the health of the gas exchange system

9.1.6 describe the functions in the gas exchange system of cartilage, smooth muscle, elastic fibres and squamous epithelium

9.1.7 describe gas exchange between air in the alveoli and blood in the capillaries

Answer:

Knowledge points:

Solution:

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