Advanced Dental Admission Test (ADAT)

Which of the following cells is found in the conducting segments of the respiratory system?

1. Goblet cells

2. Clara cells

3. Kulchitsky cells

4. Mesothelial cells

The correct answer is: Kulchitsky cells

The conducting segments of the respiratory system, which include structures such as the trachea and bronchi, are lined with various types of cells that have specific functions. Kulchitsky cells, also known as neuroendocrine cells, are indeed found in the conducting airways. These cells play a crucial role in the regulation of airway tone and secretion by releasing various neuropeptides and hormones, which can influence airflow and other respiratory functions. In contrast, goblet cells are primarily involved in secretion, particularly mucus, to trap particles and pathogens. While they are abundant in the respiratory epithelium, their primary role is not related to the conducting function of airways. Clara cells, which are more commonly found in the terminal bronchioles, contribute to detoxification and surfactant production, but they are not characteristic of the larger conducting pathways. Mesothelial cells are typically associated with the lining of body cavities and do not play a direct role in the respiratory system. Thus, the presence of Kulchitsky cells in the conducting segments highlights their important neuroendocrine function in regulating respiratory processes.