Lung structure

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  • Created by: patricia
  • Created on: 21-11-13 16:19
Lungs are site of what in a mammals?
Gas exchange
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State two reasons why lungs are inside the body.
1) Air is not dense enough to support and protect delicate tissue 2) they would otherwise lose a great deal of water
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What are lungs protected by?
A bony box called the Rib Cage
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What is the disadvantage of the lungs compared to the thorax?
Lungs are not muscular enough to ventilate therefore the thorax changes shape
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What is the trachea what is it supported by?
It is a flexible airway supported by cartilage
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What does the cartilage do for the trachea?
Prevents the trachea from collapsing as the air pressure inside the lungs fall
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What are the tracheal walls made out of?
Muscles lined with ciliated epithelium and goblet cells
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What do goblet cells do?
They rroduce mucus that trap dirt particles and bacteria from the air breathed in
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What does the cilia do?
It move the mucus, laden with dirt and microrganisms up to the throat, pass the oesophagus into the stomach
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What is a bronchi?
Two divisions of the trachea, each leading to one lung
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How are the bronchis similar to the trachea?
They produce mucus to trap dirt particles and have cili to move dirt-laden mucus tord the throat
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What are bronchioles?
They're branching subdivisions of the bronchi
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What are the walls of the bronchioles made of?nd what is their function?
They're made out muslces lined of epithelial cells this allows them to contrict to control the amount of flow in and out of alveoli
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What are alveoli's?
Minute air sacs at the end of the bronchioles?
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What are alveoli's made of? Function?
Contain collagen and elastic fibres. Elastic fibres to allow alveoli's to stretch. In order to expel carbon dioxide rich airnout and inhale oxygen rich air in
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State two reasons why humans need to absorb large volumnes of oxygen from the lungs?
1)Humans are large 2)humans have large volumne of cells 3) humans have high metabolic rate 4) high metbolic temp
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List in the correct sequence all the structures that air passes through on it's journey from the gaseous exchange surface of the lungs to the nose
Alveoli, Bronchioles, Bronchi nd Trachea
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Explain how the cells lining the trachea and bronchus protect the alveoli from damage
Goblet cells produce mucus that traps particles of dirt and bacteria to the air breathed in. The cilia move the the dirt laden mucus up the trachea into the stomach. This is because bacteria can cause infection
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Other cards in this set

Card 2

Front

State two reasons why lungs are inside the body.

Back

1) Air is not dense enough to support and protect delicate tissue 2) they would otherwise lose a great deal of water

Card 3

Front

What are lungs protected by?

Back

Preview of the front of card 3

Card 4

Front

What is the disadvantage of the lungs compared to the thorax?

Back

Preview of the front of card 4

Card 5

Front

What is the trachea what is it supported by?

Back

Preview of the front of card 5
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