The expression 'air sacs absorb more oxygen during vigorous exercise'' describes an interaction between the musculoskeletal system and the respiratory system.
Gas exchange refers to the process by which the organism takes oxygen and eliminates CO2 during respiration.
Oxygen is fundamental for muscle cells to carry out different types of physical exercises.
In conclusion, the expression 'air sacs absorb more oxygen during vigorous exercise'' describes an interaction between the musculoskeletal system and the respiratory system.
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