Name the structures in the gas exchange system that make and secrete mucins.
Mucins are described as glycosylated proteins. Glycosylation is the addition of sugar components after polypeptides are synthesised. Suggest one cell location where glycosylation of mucin could take place.
The processes involved in making and secreting mucins are given here: translation, exocytosis, glycosylation, transcription. Finish Table 2.1 by arranging the processes in the order in which they occur.
Chloride ions move out of the mucin-producing cells at the same time as mucin is secreted. Suggest and explain how the loss of chloride ions helps mucin to form mucus.
The gas exchange system contains some cells that can divide by mitosis. Explain why having these cells in the gas exchange system is important.