I need help thanks. Rearrange the order of the following respiratory pathways to

Question

I need help thanks.

Rearrange the order of the following respiratory pathways toward the direction of the blood-air-barrier (BAB). That is, following a distal-to-proximal approach from the bronchial tree (outbound) to the lungs (inbound). Use #10 for the most distal conducting pathway, and #1 for the most proximal respiratory site. Once the correct sequence is established, classify each pathway component based on its structural functionality and whether it belongs to the conducting (C) or respiratory (R) portion of the respiratory system. () __ Terminal bronchiole () ___ Primary bronchi () ___ Alveolar sacs () ____ Trachea () ___ Tertiary bronchi () ___ Alveolus () ___ Secondary bronchi () ___ Respiratory bronchiole () ____ Alveolar ducts () ___ Carina

Explanation / Answer

1. Alveolus

2. Alveolar sacs

3. Alveolar ducts

4. Respiratory bronchioles

5. Terminal brochiole

6. Tertiary bronchi

7. Secondary bronchi

8. Primary bronchi

9. Carina

10. Trachea

The larynx opens into the long tube, the trachea. This inturn branches into two bronchi at the Carina. Within the lungs, there are more than 20 generations of branchings, each resulting in narrower, shorter and more numerous tubes, primary, secondary and tertiary bronchioles.

The walls of trachea and bronchi contain cartilage, which gives them their cylindrical shape and supports them. The first airway branches that no longer contain cartilage are called, bronchioles. Alveoli first begin to appear, attached to the walls, in the brochioles called respiratory bronchioles which appear from the terminal bronchioles. The number of the respiratory bronchioles increases in the alveolar ducts until the airways end in grape-like clusters of alveoli kept safe in the alveolar sacs.

The airways beyond the larynx can be divided into two zones:

the conducting zone - from the top of the trachea to the beginning of the respiratory bronchioles - which contains no alveoli and across which gas exchange with the blood does not occur.

the respiratory zone - from the respiratory bronchioles on down - which contain alveoli and across which gas exchange occurs.

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