The ciliated epithelial cells are required to move particles or mucus in a specific direction. In humans, these cells are mainly present in

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bronchioles and fallopian tubes

fallopian tubes and pancreatic duct

Eustachian tube and salivary duct

bile duct and bronchioles

answer is A.

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Detailed Solution

Simple columnar ciliated epithelium lines large bronchioles and fallopian tubules. The cilia sweep mucus and trapped particles towards the pharynx so that they can be expelled from the body through coughing or sneezing. This movement of mucus and particles is known as the 'mucociliary escalator' and it helps to keep the airways clear and free from debris. In the fallopian tubes, the ciliary movement helps to move the egg to the site of fertilisation and the fertilised embryos towards the uterus.
(2) Smaller bile ducts are lined by cuboidal epithelium while larger bile ducts are lined by columnar epithelium. (3) Pancreatic ducts are lined by compound epithelium.
(4) Eustachian tubes are lined by ciliated columnar epithelium. Larger salivary ducts are lined by stratified columnar epithelium.

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