The trachea and mainstem bronchi:

A) constrict violently when their beta-2 receptors are stimulated excessively.
B) are approximately 10 to 12 cm in length and are joined together at the hilum.
C) do not contain mucous-producing cells in patients without a respiratory disease.
D) are lined with beta-2 receptors that result in bronchodilation when stimulated.


Answer: D) are lined with beta-2 receptors that result in bronchodilation when stimulated.

Anatomy & Physiology

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