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Home Q & A Board Biology-Related Homework Help Medicine Nursing and Clinical
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barry barry
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12 years ago
John, a 72-year-old grandfather, had been smoking heavily for 24 years and had a persistent cough. A biopsy of his lung tissue revealed considerable amounts of carbon particles. How could this happen considering the natural cleaning mechanism of the respiratory system?
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biology101biology101
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#1
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12 years ago
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barry Author
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12 years ago
Thanks
kevin12323h
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Yesterday
Smart ... Thanks!
kobbhy
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2 hours ago
Just got PERFECT on my quiz
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