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The right primary bronchus is slightly wider and at a steeper angle than the left primary bronchus. This is due mostly to the fact that the heart occupies a larger portion of the left lung than the right. This makes the right lung bigger so it needs a wider bronchus for air to fill it up. Plus since the heart is a bit more to the left, the left bronchus branches off at more of an angle. The combination of these two factors makes the right bronchus more susceptible to obstructions if a foreign object travels down the trachea leading the bronchus.

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Q: Why is the right primary bronchus a site for obstruction?
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