Examlex
Which of the following refers to activities engaged in for pleasure that include rules and often involve competition with one or more individuals?
Skin And Lungs
Primary organs in animals for protective barrier and gas exchange, respectively; skin acts as a shield against environmental hazards while lungs facilitate oxygen intake and carbon dioxide expulsion.
Alveolar Walls
Thin layers of tissue that form the structure of alveoli, the tiny air sacs in the lungs where gas exchange between the air and blood takes place.
Emphysema
A long-term, progressive disease of the lungs that primarily causes shortness of breath due to over-inflation of the air sacs.
Oxygen Content
The proportion of oxygen present within a given environment, medium, or organism, which is crucial for metabolic processes and respiration.
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