Tissues of the Gas Exchange System

  • Created by: Aleena
  • Created on: 24-10-18 16:42
form of connective tissue that provides strengthening & support,made of cells surrounded by mucopolysaccharides.it is more flexible than bone
1 of 16
Function of Cartilage
to keep the larger tubes open (trachea & bronchi) These tubes have a relatively large diameter & thin walls-without the strengthening of cartilage, would collapse
2 of 16
Ciliated Epithelium
layer of ciliated cells -cilia beat constantly wafting the mucus out of the trachea, where it can be swallowed and removed.
3 of 16
any layer of cells that form a covering/lining
4 of 16
Goblet Cells
produce mucus that lines the trachea,bronchi and larger bronchioles. These cells are found between the ciliated cells in the epithelium
5 of 16
Smooth Muscle & Elastic Fibres
maintains tone in airways & allows expansion in cases where extra oxygen is needed, Elastic fibres are found in all lung tissues- this makes lungs flexible which is needed when the lungs recoil during during expiration
6 of 16
breathing out
7 of 16
widest tube in gas exchange system,its simply a channel that allows air to reach the lungs-so must be open at all times
8 of 16
Tracheal Wall
medium thickness, has cartilage rings- that form a scaffolding to keep tube open, these are distributed at intervals- so that the soft tissue in between retain flexibility.
9 of 16
Why does trachea have c-shaped cartilage?
the oesphagus runs v.close behind the trachea & expands when food passes down it-could create friction between oesphagus + cartilage-so trachea have C-shaped cartilage,with the ends joined by tissue containing smooth muscle & elastic fibres
10 of 16
Why is it important that there's a good layer of mucus in the trachea?
cos its the first part of the gas exchange system to encounter the air,so its best if most of the dust/bacteria are trapped by the mucus here,where they can be removed the fairly short distance up the trachea & into the oesphogus to be swallowed
11 of 16
smaller diameter and thinner walls than trachea and have complete rings of cartilage not c-shaped as it isn't in contact with oesophagus
12 of 16
There are many bronchioles + vary in size/structure as they get smaller towards the alveoli.
13 of 16
Why don't Bronchioles have cartilage?
although walls of bronchioles are thin, narrow tubes tend to be more self-supporting so don't need cartilage.
14 of 16
large vs small bronchioles
large: have elastic fibres + smooth muscle-to adjust diameter of sirways to increase/decrease air flow small:only have elastic fibres
15 of 16
arranged in groups at end of the smallest bronchioles, the alveolar wall consists of a single layer of epithelium + an extracellular matrix contains elastic fibres-allows expand during inspiration and recoil during expiration
16 of 16

Other cards in this set

Card 2


Function of Cartilage


to keep the larger tubes open (trachea & bronchi) These tubes have a relatively large diameter & thin walls-without the strengthening of cartilage, would collapse

Card 3


Ciliated Epithelium


Preview of the front of card 3

Card 4




Preview of the front of card 4

Card 5


Goblet Cells


Preview of the front of card 5
View more cards


No comments have yet been made

Similar Biology resources:

See all Biology resources »See all Exchange Systems resources »