What is the biological meaning of the expansion of the bronchi with an increase in the tone of the sympathetic nervous system?

An increase in the tone of the sympathetic nervous system occurs as a result of the body’s adaptation to environmental changes. This may be due to the impact of some kind of stress factor. At the same time, the heartbeat and breathing become more frequent, the pupils dilate, the vessels of the skin narrow. Due to the increased respiratory rate, the bronchi undergo expansion, which allows the body to quickly adapt.

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