text: The amount of anesthetic required to prevent 50% of patients from moving in response to surgical stimuli is called the "minimum concentration" of these structures.
full_question: The amount of anesthetic required to prevent 50% of patients from moving in response to surgical stimuli is called the "minimum concentration" of these structures. The imbalance between alpha-1- antitrypsin and elastase in the walls of these structures can lead to a common disease. The type II "great" cells in these structures secrete lecithins such as DPPC, the primary constituent of (*) surfactant. As their radius decreases, these structures are more likely to collapse. Emphysema destroys the walls of these structures, which are shaped like hollow cavities, and interface with blood vessels that release carbon dioxide and load up on oxygen. For 10 points, name these thin-walled air sacs that are found all throughout the mammalian lung.
first_sentence: The amount of anesthetic required to prevent 50% of patients from moving in response to surgical stimuli is called the "minimum concentration" of these structures.
raw_answer: alveoli [accept word forms, such as alveolus and alveolar; prompt on lungs]