Ha u ntse u iponahatsa moeeng ka sistimi ea phefumoloho ea motho le lisebelisoa tsa Alveolus , rang li ka etsa hore re sebelise likopo tsa boiphetetso tsa motho ka marang-rang mabapi le . tsamaiso ea mabenkele a marang- mabapi le tsamaiso ea pherekano ea motho le sanalus . Ntle le lenane la sehlahisoa ka tlase, u ka etsa kopo ea sistimi ea hau e ikhethang ea motho le mokhoa oa hau oa ho phefumoloha oa moea le mofuta oa alveolus ho latela litlhoko tsa hau tse khethehileng.