Ciliated Columnar Epithelial Cells in Humans

Ciliated columnar epithelial cells are a type of tissue that is found in various parts of the human body. The cells are characterized by their tall, columnar shape and the presence of cilia, which are hair-like structures that protrude from the cells.

Locations of ciliated columnar epithelial cells:

- Bronchioles: These are the small airways in the lungs that lead to the alveoli. The ciliated columnar epithelial cells in the bronchioles help to move mucus and other particles out of the lungs.

- Fallopian tubes: These are the tubes that connect the ovaries to the uterus in females. The ciliated columnar epithelial cells in the fallopian tubes help to move the egg from the ovary to the uterus.

Other locations where ciliated columnar epithelial cells may be found include:

- Eustachian tube: This is the tube that connects the middle ear to the back of the throat. The ciliated columnar epithelial cells in the Eustachian tube help to equalize pressure in the middle ear.

- Urethra: This is the tube that carries urine from the bladder to the outside of the body. The ciliated columnar epithelial cells in the urethra help to move urine out of the body.

- Stomach lining: The stomach lining is composed of several types of cells including ciliated columnar epithelial cells. These cells help to move mucus and other substances out of the stomach.

- Bile duct: The bile duct is a tube that carries bile from the liver to the small intestine. The ciliated columnar epithelial cells in the bile duct help to move bile along the duct.

- Oesophagus: The oesophagus is the tube that carries food from the mouth to the stomach. The ciliated columnar epithelial cells in the oesophagus help to move mucus and other substances out of the oesophagus.

Therefore, the correct option is B, which states that ciliated columnar epithelial cells occur in bronchioles and fallopian tubes.