Hasharotlarning traxeya naychalariga havo qanday kiradi?
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naychalar devorining qisqarishi tufayli
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traxeya naychalari va atmosfera havosi o’rtasidagi bosim farqi sababli
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jabra yoriqlari pardasining qisqarishi sababli
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qorin muskullarining damba- dam qisqarishi tufayli
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