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Cilia play very important role in bronchioles. They push the foreign particles outward.

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What muscle controls the size of the bronchioles in the lungs?

SmooTh muscle


What part of the respiratory tree has the largest proportion of smooth muscle?

Bronchioles


What are the walls of the bronchioles made up of?

The walls of the bronchioles are made up of smooth muscle, connective tissue, and epithelial cells.


What is an example of a smooth involuntary muscle?

ones that line the walls of the trachea and bronchioles


What is bronchioles filled with?

Bronchioles are approximately 1mm or less in diameter and their walls consist of ciliated cuboidal epithelium and a layer of smooth muscle.


The diameter of bronchioles can change because their walls contain?

Smooth Muscle tissue relaxation and contraction is responsible for dilation and constrictions of the bronchioles, respectively.


What small structures located within the bronchial tree are composed primarily of smooth muscle?

Bronchioles are smaller tube divisions of bronchi. Walls of bronchioles contain smooth muscle and no cartilage. This helps in contraction and relaxation which allows the flow of air to alveoli.


What is the medical term meaning contraction of the smooth muscle in the walls of the bronchi and bronchioles that tighten and squeeze the airway shut?

Bronchoconstriction or bronchospasm is the medical term that refers to the contraction of the smooth muscle in the walls of the bronchi and bronchioles that tighten and squeeze the airway shut.


What is the functional importance of the decrease in cartilage and increase in smooth muscle in the lower respiratory passageways?

The smooth muscle in the walls of the bronchioles is very sensitive to the concentration of carbon dioxide. A rising level of CO2 causes the bronchioles to dilate. This lowers the resistance in the airways and thus increases the flow of air in and out.


Are the lungs composed of smooth muscle?

No, the lungs are not composed of smooth muscle. They are made up of a spongy tissue called lung parenchyma, which includes air sacs and blood vessels. Smooth muscle is found in the walls of the airways leading to the lungs, called bronchioles.


How does a inhaler affect the muscle around the bronchioles?

it reduces the swelling


Does the alveoli have smooth muscle?

No, the alveoli do not have smooth muscle. Alveoli are small air sacs in the lungs where gas exchange occurs, allowing oxygen to enter the bloodstream and carbon dioxide to exit. Smooth muscle is found in the walls of larger airways like bronchioles, which help regulate the diameter of the airways.