Yomg’ir chuvalchangining halqasimon muskullar qisqarganda qanday o’zgarish kuzatilishini belgilang.
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tanasi uzunlashadi va ingichkalashadi
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nafas olishi kuchayadi
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tanasi kaltalashadi
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qon tomirlarida qonning oqishi tezlashadi
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tanasi yo’g’onlashadi, kattalashadi
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