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contraction
mastery UK /kənˈtɹækʃn̩/ US /kənˈtɹækʃ(ə)n/noun
card 1 of 10 · fill in the blank
During exercise, the rapid _____ and relaxation of muscles increases blood flow.
card 1 of 10 · fill in the blank
During exercise, the rapid _____ and relaxation of muscles increases blood flow.