SmooTh muscle
The size of the primary bronchioles are from 0.3-1.0 mm then go further to the terminal bronchioles which are smaller in size which connect to the alveoli.
iris
Cilia play very important role in bronchioles. They push the foreign particles outward.
The Iris.
pectorals
The heart you idiot!
Yes it is.
The heart you idiot!
The iris.
Eye trauma can damage the muscle that controls pupil size.
Respiratory bronchioles and the alveoli are the smallest part in case of the lungs. There are millions of them in your lungs.
The diameter of the airways diminishes, the epithelium changes, cartilage disappears early in the tertiary bronchi, and the bronchioles have only smooth muscle spiraled around them!