3.1.4- Measuring Lung Volumes Flashcards Preview

Biology AS- Chapter 3.1- Exchange Surfaces And Breathing > 3.1.4- Measuring Lung Volumes > Flashcards

Flashcards in 3.1.4- Measuring Lung Volumes Deck (21):

Explain what the oxygen uptake is.

The volume of oxygen absorbed by the lungs in one minute.


What is the tidal volume?

The volume of air inhaled or exhaled in one breath- usually measured at rest.


What is a spirometer?

A device that can measure the movement of air into and out of the lungs.


What is vital capacity?

The greatest volume of air that can be expelled from the lungs once the bee pest possible breath has been took.


Examiner what the float chamber spirometer is and how it works.

It consists is a chamber of air that floras on a tank of water. During inspiration, air is drawn in from fm the chamber, moving the lid down. Expiration- the air returns into the chamber, raising the lid again. A pen is connected to the lid and draws results on a data logger.


Explain how the float chamber spirometer allows for the measurement of oxygen consumption only.

The expurgated air is CO2 rich and it passes through a chamber of soda like that absorbs this CO2- meaning only oxygen consumption is measured.


List five precautions that should be taken when using a float chamber spirometer.

-subject should be healthy and asthma free
-soda line needs to be fresh and functioning
-mouthpiece needs to be sterilised
-water chamber must not be overfilled so no water enters the air tubes
-there should be no air leaks in the apparatus sad it will give invalid and inaccurate results


Explain what modern spirometers are, what they can do and any limitations of them.

They are small and simple hand held devices. They record the movements of air in and out of the lungs. Limitations- they cannot measure the rate f oxygen consumption only.


What two things does the total lung volume consist of?

The residual volume (unmeasurable) and t to he vital capacity.


List four things that can affect the vital capacity of a person.

Age. Gender. Size of the person- in particular height. Their level of regular exercise.


For an average person, what is the vital capacity normally within a region of?

2.5-5 dm^3


What is the residual volume?

The volume of air that remains in the lungs, even after forces expiation. It remains in the airways and alveoli and is normally about 1.5dm^3.


Hat is the typical tidal volume of a person?

About 0.5dm^3 at rest.


Breathing supplies oxygen for ________ and removed the __________ produced in respiration.




Explain how the volume of oxygen intake is measured using a float chamber spirometer.

As a person breathes from the spirometer, they absorb the oxygen into their blood and it is replaced by CO2 (that is absorbed by the soda lime) therefore the volume of air removed from the chamber is the oxygen intake level.


How can the decrease of volume in the float chamber be observed and measured?

Using a spirometer trace.


Explain how you an measure the oxygen uptake from a spirometer trace.

Draw a line horizontally from one point on the trace to the X axis and repeat with anther point on the traces readings. Measure the difference in volume between these two points and and divide this by the time taken for this decrease (in seconds) and record the rate of oxygen uptake that will be given in dm^3s^-1.


explain how the breathing rate can be measured by using a spirometer.

Count the number of peaks in each minute (normally about 12- 14).


What does a higher oxygen uptake result from?

An increased oxygen demand- e.g; during exercise when the muscles are respiring more.


Meh at two things will increased oxygen uptake result from?

I crossed breathing rate and deeper breaths.


What is breathing rate?

The number of breaths per minute.