The bronchial tubes branch times before they terminate in t

The bronchial tubes branch ____________ times before they terminate in the alveoli.

Solution

The bronchial tubes branch 10 times before they terminate in the alveoli.

The trachea divides into 2 tubes the major or primary bronchi. In the lungs, the primary bronchi divide into secondary bronchi which further subdivides into tertiary bronchi. The tertiary bronchi then divide into many smaller bronchioles which further divide into terminal bronchioles, each of which then gives rise to several respiratory bronchioles. These then divide into alveolar ducts which enter the alveolar sacs which are a cluster of aveoli. The alveolus thus forms the basic unit of gas exchange in the lung.