It is due to the presence of smooth muscle.
Gas exchange does not occur in the segmental bronchi. The primary function of the segmental bronchi is to conduct air to the lungs' alveoli, where gas exchange takes place. The walls of the bronchi are lined with cartilage and smooth muscle, which support airflow but do not facilitate the exchange of oxygen and carbon dioxide. Gas exchange primarily occurs in the alveolar sacs, where the thin walls allow for efficient diffusion of gases.
The volume of air that cannot undergo gas exchange is known as dead space. It consists of the air in the conducting airways (trachea, bronchi, bronchioles) where gas exchange does not occur because it does not reach the alveoli where oxygen and carbon dioxide exchange takes place.
The bronchi are the tubes that actually carry the air to the lungs, they have a different function than the alveoli which function in the process for gas exchange.
Bronchi and bronchioles do help to increase the surface area available for gas exchange in the lungs, but they also contribute to anatomical dead space. Anatomical dead space refers to parts of the respiratory system where no gas exchange occurs, such as the trachea and bronchi, including the smaller bronchioles. While the bronchi and bronchioles facilitate airflow and lead to the alveoli where gas exchange happens, they themselves do not participate in this process, thus contributing to the dead space.
No, bronchi is a passage of airway in the respiratory tract that conducts air into the lungs. No gas exchange takes place in this part of the lungs.
respiratory zone is from respiratory bronchioles (generation 17-19) to alveolar ducts (generation 20-22) to alveolar sacs (generation 23). It is the site of gas exhange, where velocity of gas is low, and diffusion is the dominant mechanism of gas exchange.
Pathway of air: nasal cavities (or oral cavity) > pharynx > trachea > primary bronchi (right & left) > secondary bronchi > tertiary bronchi > bronchioles > alveoli (site of gas exchange
The gas occurs by simple diffusion through the cells.
The trachea branches into the left and right main bronchi, which further divide into smaller bronchi within the lungs. These smaller bronchi continue to branch into bronchioles, which eventually lead to alveoli where gas exchange occurs.
the alveolus
in the leave
gills