Final answer:
The conduits that transport gas to and from the gas exchange sites in the human respiratory system are the bronchioles, which lead directly to the alveoli where gas exchange occurs.
Step-by-step explanation:
The conduits that transport gas to and from gas exchange sites in the human respiratory system are the bronchi, bronchioles, and alveoli. Specifically:
- Trachea: When we inhale, air travels down the pharynx and into the trachea, which is the first major conduit of the airways.
- Bronchi: The trachea divides into the right and left bronchi as it enters the lungs, which in turn branch into smaller passages called bronchioles within each lung.
- Bronchioles: These are the smaller airways that extend from the main bronchi and lead to the alveolar sacs.
- Alveoli: These are the tiny air sacs where gas exchange occurs between the lungs and the blood. They are connected to the bronchioles via alveolar ducts and alveolar sacs.
Therefore, the correct answer is C) Bronchioles, as they are the conduits that lead directly to the gas exchange sites, the alveoli.