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LUNG NOTES




Gas Exchange is effective in the lungs because of:
The Thin Barrier: Both alveoli and capillary are 1 cell thick. They both have SQAMUMOUS EPITHELIUM.
They are an in close contact with each other to reduce diffusion pathway. The barrier is less than 1um
thick. The capillaries are…

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LUNG NOTES

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LUNG NOTES




Tissue in the lungs

TRACHEA, BRONCHUS, BRONCHIOLES: - allow passage of air. They are all large enough to allow
air to flow without any obstructions. They each divide into something smaller until they reach
the alveoli. They are strong enough to prevent collapsing when air pressure is low.…

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LUNG NOTES




VENTILATION is the movement of air over the gas exchange system. In humans ventilation is a
TIDAL PROCESS because air enters and exits through the same way. Breathing rate usually is 12
xs per minute. However, when exercised or scared breathing becomes faster and deeper.
Allowing more oxygen…

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LUNG NOTES




A SPIROMETER is an oxygen filled chamber with about 6dm3 of oxygen in it. It floats on a tank of water. It
counterbalanced so gas drawn out/in makes the chamber rise/fall.

Movements are recorded using a data logger or by a pen writing on a revolving drum (KYRMAGRAPH).…

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LUNG NOTES




Correct functioning equipment ­ such as hinges and chambers working properly.

SPIROMETER TRACES




Soda lime absorbs CO2 so over time total amount of gas in the spirometer will decline.

Volume of CO2 exhaled is equal to volume of O2 used up.

If a line could be straight line…

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LUNG NOTES




Residual volume = (Expiratory Reserve X 6) ­ vital capacity




LUNG TRANSPORT GLOSSARY
TISSUE: A group of similar cells that perform a particular function. Sometimes but not always attached together. An example
would be the nervous tissue in animals.

ORGAN: A collection of tissues that work together to…

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LUNG NOTES




FORCED EXPIRATION: Shows expiratory reserve volume. The abs contract, the internal intercostals muscles contract and a
larger and faster expiration occurs. Also used in exercise

SPIROMETER: A device that measures a person breathing. It's a chamber filled of medical grade oxygen 6dm3 which floats
on a tank of…

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