Spruce gum is a chewing material made from the resin of spruce trees. (Wikipedia. 2024. Spruce gum. [Cited 12 November 2024]. https://en.wikipedia.org/wiki/Spruce_gum)
Lung ventilation is an essential part of respiration, responsible for the gas exchange between alveoli and the atmospheric air. It involves regularly replacing stale gases in the lungs with fresh gases from the atmosphere. (DOI:
10.1093/med/9780198784975.003.0003
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DOI: 10.1093/med/9780198784975.003.0003)
