SMOOTH MUSCLE By N., Pam M.S. - April 13, 2013 any muscle that is not striated that can stay contracted for a long period of time such as blood vessels, digestive organs and the muscles around the eyes. See cardiac muscle; skeletal muscle. SMOOTH MUSCLE: "Smooth muscle is an involuntary muscle." Related Psychology Terms SKELETAL MUSCLE CARDIAC MUSCLE FAST MUSCLE FIBER CARDIOVASCULAR (CV) SLOW MUSCLE FIBER STAIRCASE PHENOMENON SOMATIC NERVOUS SYSTEM PERIPHERALISM ROBAXIN CARDIAC MUSCLE Cite this page: N., Pam M.S., "SMOOTH MUSCLE," in PsychologyDictionary.org, April 13, 2013, https://psychologydictionary.org/smooth-muscle/ (accessed February 19, 2020).