Myocardialperfusioniswellcontrolledbyadjustmentofvasomotortoneofre-sistancevessels.Thestaticandsamedynamicaspectsofcoronaryflowcontrolcanwellbedescribedbyassumingfeedbackfromtissueoxygenpressuretothecoronaryvessel.Theseresistancevesselsaresmallarteriesfrom400/mandlessinarteriolesdownto10/m.Itisnotclearyethowvesselsofdifferentsizecanbeunderthecon-troloftissuefactorsandhowadaptationoftoneinlargervesselsistunedtothatofsmallerones.
