AP BIOLOGY

Detailed explanation-1: -From the windpipe, air moves into the lungs through tubes called bronchi. The bronchi lead to smaller tubes called bronchioles, which look like the branches of a tree.

Detailed explanation-2: -In your lungs, the main airways (bronchi) branch off into smaller and smaller passageways-the smallest, called bronchioles, lead to tiny air sacs (alveoli).

Detailed explanation-3: -As the branches become finer and finer, the amount of cartilage decreases and finally disappears in the bronchioles. Primary bronchi divide into secondary (lobar) bronchi. The secondary bronchi divide into tertiary (segmental) bronchi. The tertiary bronchi divide into intralobular bronchioles.

Detailed explanation-4: -Your trachea divides into your left and right bronchi. The bronchi carry air into your lungs. At the end of the bronchi, the bronchioles carry air to small sacs in your lungs called alveoli. The alveoli perform your body’s gas exchange.

Detailed explanation-5: -The segmental bronchi divide into many smaller bronchioles that divide into terminal bronchioles, and then into respiratory bronchioles, which divide into 2 to 11 alveolar ducts. Each alveolar duct has 5 or 6 associated alveolar sacs.