The risk of lung cancer in a smoker rises with
Correct answer: D. the number of cigarettes per day and the number of years of smoking
- A. the brand of cigarette
- B. the time of day the cigarettes are smoked
- C. the length of the filter
- D. the number of cigarettes per day and the number of years of smoking
Explanation
Cancer risk follows cumulative dose: each cigarette adds exposure to carcinogens over years of tissue damage. No brand or filter makes the dose safe.
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About Human Respiratory System
The human respiratory system conducts air to the alveoli, where oxygen and carbon dioxide exchange occurs across thin respiratory surfaces. Questions cover the nasal passage, trachea, bronchi, lungs, diaphragm and intercostal muscles, ventilation mechanics and gas transport, while distinguishing breathing and gaseous exchange from cellular respiration.
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