Calculating The Dead Space
Just as dead space wastes a fraction of the inhaled breath, dead space dilutes alveolar air during exhalation. By quantifying this dilution it is possible to measure anatomical and alveolar dead space, employing the concept of mass balance, as expressed by Bohr equation.
-
- where is the dead space volume and is the tidal volume;
- is the partial pressure of carbon dioxide in the arterial blood, and
- is the partial pressure of carbon dioxide in the expired (exhaled) air.
Read more about this topic: Dead Space (physiology)
Famous quotes containing the words calculating the, calculating, dead and/or space:
“[The] elderly and timid single gentleman in Paris ... never drove down the Champs Elysees without expecting an accident, and commonly witnessing one; or found himself in the neighborhood of an official without calculating the chances of a bomb. So long as the rates of progress held good, these bombs would double in force and number every ten years.”
—Henry Brooks Adams (1838–1918)
“Sin in this country has been always said to be rather calculating than impulsive.”
—Frank Moore Colby (1865–1925)
“A living thing is distinguished from a dead thing by the multiplicity of the changes at any moment taking place in it.”
—Herbert Spencer (1820–1903)
“Thus all our dignity lies in thought. Through it we must raise ourselves, and not through space or time, which we cannot fill. Let us endeavor, then, to think well: this is the mainspring of morality.”
—Blaise Pascal (1623–1662)