QuestionSBA
QuestionChoice
This epithelium is named 'pseudostratified columnar' due to the single layer of column-shaped cells appearing to be arranged in layers. The epithelium surface is also ciliated to trap dust particles, warm the airway, and secrete mucus.
10000501
a
Pseudostratified ciliated columnar epithelium
QuestionChoice
The upper respiratory tract is lined by columnar cells (column-shaped), not squamous (flat). Additionally 'keratinised' refers to the protein keratin produced by keratinocytes in skin - hence why keratinised stratified squamous epithelium is found mainly in the skin. The upper respiratory tract epithelium is pseudo-stratified as it is exposed to less mechanical damage than areas which are protected by stratified epithelium.
10000503
c
Keratinised stratified squamous epithelium
QuestionChoice
Whilst the cells which line the upper respiratory tract are pseudostratified, they are also ciliated and are columnar epithelial cells, not squamous epithelial cells.
10000502
b
Pseudostratified squamous epithelium
QuestionChoice
Cuboidal cells are found in glands which secrete specialised substances, such as sweat glands. Whilst the respiratory tract does secrete small amounts of mucus, this is secreted by goblet cells which line the columnar cells of the pseudostratified ciliated columnar epithelium of the upper airway.
10000505
e
Stratified cuboidal epithelium
QuestionChoice
The upper respiratory tract is lined by columnar epithelium, not squamous, and is pseudostratified not stratified. Non-keratinised stratified squamous epithelium is found in areas such as the oesophagus.
10000504
d
Non-keratinised stratified squamous epithelium
Concept
Chapter
2693
3777
Structure of the respiratory tree
Topic
150
Respiratory physiology
12647
Which of the following cell types line the upper respiratory tract?
a