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Support structures change: irregular plates of cartilage replace the cartilage rings, and by the time the bronchioles are reached, the tube walls no longer contain supportive cartilage.
Epithelium type changes: the mucosal epithelium things as it changes from pseudostratified columnar to columnar and then to cuboidal in the terminal bronchioles. Mucus-producing cells and cilia are sparse in the bronchioles. For this reason, most airborn debris found at or below the level of the bronchioles must be removed by macrophages in the alveoli.
Amount of smooth muscle increases: the relative amount of smooth muscle in the tube walls increases as the passageways become smaller. A complete layer of circular smooth muscle in the bronchioles and the lack of supporting cartilage (which would hinder construction) allows the bronchioles to provide substantial resistance to air passage.
What else can I help you with?
What are the changes that occur as a comet orbits the sun?
it gets a tail
What is the size of inertia when mass gets smaller?
Inertia decreases as mass gets smaller. Inertia is a measure of an object's resistance to changes in its state of motion, and is directly proportional to mass. As mass decreases, so does the inertia of the object.
How does area change when the length changes?
When length gets longer the area will be larger. As the length gets shorter the area will be smaller.
What causes size changes of nose and ears when one ages?
your face gets smaller
What are the continual changes in a changing technology?
it gets faster, smaller, bigger, better, smarter.
Effect of climate changes to north and south pole?
Ice melts, the area of ice gets smaller.
What can change the volume of a gas?
Change the pressure or change the temperature. Volume changes inversely with pressure and directly with temperature. That is to say, if you squeeze it, it gets smaller. If you heat it, it gets bigger.
What does it mean when your hermit crab changes into a smaller shell?
It just means the hermie like the smaller one better, no harm done, when it gets bigger it will just move out don't worry
What happens to a line when the slope is a smaller and smaller?
As the slope gets smaller and smaller the line gets flatter and flatter (or more horizontal).
What gets louder as it gets smaller?
A frog?
What is which when it gets larger it also gets smaller?
baloon
When does contraction happen?
when heat gets transferred it gets smaller.
