First 320 words of the document:
Reianna Shakil L6EFBiology24/09/12
Table to show structure, function and distribution of tissues in the respiratory system
Name of Description of structure Function in lung Distribution in lungs Additional notes
tissue (annotated diagram) (which structures it is
Pavement Allows rapid diffusion of gases Walls of alveoli They are flat and thin. They
(squamous between alveoli and the blood sit on basement membranes.
Ciliated Moves trapped dirt in mucus up to the Lines the trachea and ends of
epithelium throat so they are swallowed and then the bronchioles
killed by the stomach acid
Goblet Produces mucus to trap dust and Found in the walls of the
cells bacteria that is then breathed in. Mucus bronchioles
is then then swallowed.
Cartilage A tough tissue that helps to support the In the trachea in `C' shaped Flexible connective tissue
walls of the trachea and bronchi. It holds rings and in the bronchi as `O' composed of chondrocytes
airways open keeping air resistance shaped rings. Not found in that produce collagen fibres.
low. bronchioles. Cartilage does not contain
Smooth When the smooth muscle contracts, it Found in the walls of the A type of muscle that contracts
muscle narrows the airways useful in changing trachea, bronchi and slowly and steadily and can
diameter of small bronchioles bronchioles. remain contracted for long
periods of time. It is
widening for more oxygen in/out of
involuntary muscle no
lungs during exercise. conscious control over its
Elastic They are especially important where Found in the walls of all the
fibres they occur around the alveoli. During airways, even the very
breathing in, the alveoli expand, smallest ones.
stretching the elastic fibres. For the
reverse, the fibres recoil, helping to