I. Characteristics of Gastrointestinal Smooth muscle 1. General physiological characteristics >low excitibility >slow contractility > high extensibility >tonicity >Sensitive for chemical, thermal and mechanical stretch stimulation1. General physiological characteristics Ⅱ.Characteristics of Gastrointestinal Smooth Muscle ➢low excitibility ➢high extensibility ➢tonicity ➢Sensitive for chemical, thermal and mechanical stretch stimulation ➢slow contractility