Lung structure Flashcards
Why are the lungs located inside the body? (2)
1- The air is not dense enough to support them
2-They would dry out
What are the lungs supported by?
How can they move?
the ribcage
the use of the intercostal muscles.
What is the trachea?
What are the walls of the trachea made up of?
What features do the walls have?
a flexible airway supported by rings
of cartilage which prevents the trachea from collapsing when the air pressure inside falls.
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The walls are made up of muscle, lined with ciliated epithelium and goblet cells
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1-The goblet cells produce mucus which traps dirt and bacteria.
2- The cilia move the mucus up to the
throat where it is swallowed.
what is the bronchi?
What are larger bronchi supported by?
1- 2 divisions of the trachea.
2-supported by cartilage.
What are the bronchioles?
What are the walls made up of?
what do the muscles in the bronchioles do?
branching subdivisions of the
bronchi.
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The walls are made of muscle lined with epithelial cells
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The muscle enables them to control
the flow of air in and out of the alveoli.
What are the alveoli?
What do they contain?
Site of gas exchange
Minute air-sacs at the end of the
bronchioles.
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Contain collagen
and elastic fibres.
pseudostratified epithelium
ciliated cells, goblet cells, basal cells
What problems come with lung expansion?
What feature does the lungs have to solve this issue?
organs in the body increase in size, they will touch other organs because of the lack of space. Problems with lung expansion This is a danger because living tissue is very delicate and when tissues rub against each other, friction could be generated.
This friction could damage the tissue and kill cells.
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a protective bag called the
pleural membrane surrounds the lungs, which are likely to rub against other organs during the breathing process
