THORAX ABDOMEN AND PELVIS

Detailed explanation-1: -The conducting portion end at the terminal bronchiole. The respiratory portion begins from the respiratory bronchiole and continues with the alveolar ducts, alveolar sacs, and finally ends at the alveoli where the significant exchange of gases takes place.

Detailed explanation-2: -The terminal bronchioles subdivide into microscopic branches called respiratory bronchioles. The respiratory bronchioles subdivide into several alveolar ducts. Numerous alveoli and alveolar sacs surround the alveolar ducts.

Detailed explanation-3: -Bronchioles end in tiny air sacs called alveoli, where the exchange of oxygen and carbon dioxide actually takes place. Each person has hundreds of millions of alveoli in their lungs. This network of alveoli, bronchioles, and bronchi is known as the bronchial tree.

Detailed explanation-4: -In your lungs, the main airways, called bronchi, branch off into smaller and smaller passageways. The smallest airways, called bronchioles, lead to tiny air sacs called alveoli.