What is the term for the ducts that lead to the alveolar sacs?

The term for the ducts that lead to the alveolar sacs is alveolar ducts. These structures are integral components of the respiratory system, connecting the bronchioles to the alveolar sacs where gas exchange occurs. The alveolar ducts are lined with alveoli, which are tiny air sacs where oxygen and carbon dioxide exchange takes place, facilitating respiration.

In contrast to the alveolar ducts, bronchioles refer to smaller branches of the bronchi that lead to the alveolar ducts but do not directly connect to the alveolar sacs. The trachea serves as the main airway, conducting air from the oral cavity and nasal passages down into the lungs, but it does not directly connect to the alveolar sacs. The conducting zones describe the parts of the respiratory system that transport air but do not engage in gas exchange, encompassing structures like the trachea, bronchi, and bronchioles, rather than the alveolar ducts specifically. The focused role of the alveolar ducts in leading directly to the alveolar sacs distinguishes them as the correct answer for this question.