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The Dyson Light Ball (UP22) is the replacement for the DC40 (ERP) upright, and is similar to the DC40 ERP in many respects except that it has a totally redesigned powerhead, incorporating a direct-drive, large-diameter brushroll with an internal "epicyclic" geared motor, similar to the DC50 and Small Ball.
The internal oblique performs two major functions. Firstly as an accessory muscle of respiration, it acts as an antagonist (opponent) to the diaphragm, helping to reduce the volume of the chest cavity during exhalation. When the diaphragm contracts, it pulls the lower wall of the chest cavity down, increasing the volume of the lungs which then ...
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