If by "dynamic pressure" you mean the difference between total (or ram) pressure and static pressure (in other words like IAS) then I guess you could look at it that way.
I look at it this way: if an unsupercharged four-stroke engine is 500 cubic inches displacement, then every two revolutions it pumps 500 cubic inches of mixture (mostly air). The pressure in the inlet manifold equals atmospheric pressure minus the drop across the venturi. The faster the engine turns, the more air volume is pumped per second, and thus the bigger the pressure drop.
So, at fixed throttle, more RPM >> lower MP, and less RPM >> higher MP.