A student made some labelled drawings of lung tissue using the high-power lens of a light microscope, but did not label two airways, $$$P$$$ and $$$Q$$$. The drawing of the lining layer of $$$P$$$ showed both ciliated cells and goblet cells, whilst the drawing of the lining layer of $$$Q$$$ showed ciliated cells but very few goblet cells. What are airways $$$P$$$ and $$$Q$$$ ?

Biology

IGCSE&ALevel

CAIE

Exam No：9700_w16_qp_12 Year：2016 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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