What do the mucous and cilia in trachea bronchi?

In the respiratory system specifically in the trachea and bronchi, the mucous and cilia work together to protect the body by performing crucial funtions:

1. Trapping Inhaled Particles: The mucous layer in the trachea and bronchi acts as a sticky trap. When we inhale, various particles such as dust, pollens, bacteria, and other inhaled substances get trapped in this mucous layer.

2. Cilia Sweep: The trachea and bronchi are lined with ciliated cells. Cilia are tiny, hair-like structures that are in constant motion, beating in a coordinated manner. This beating creates a wave-like movement that helps to move the mucous layer, along with the trapped particles, upward toward the throat.

3. Expelling Mucosa: The mucous and the trapped particles eventually reach the throat where reflex mechanisms like coughing or swallowing help expel the mucous from the respiratory tract. This expectoration process helps clear harmful substances and microorganisms out of the respiratory system, preventing infections and maintaining respiratory health.

The combination of the mucous layer and the cilia's sweeping action provides an important defense mechanism, filtering and removing foreign particles and irritants from the air we breathe before it reaches the sensitive tissues of the lungs.