Heart rate persons with coronary artery disease. The heart rate is rhythmically generated by the sinoatrial node. It is also influenced by central factors through sympathetic and parasympathetic nerves. Nervous influence over the heartrate is centralized within the two paired cardiovascular centres of the medulla oblongata. The cardioaccelerator regions stimulate activity via sympathetic stimulation of the cardioaccelerator nerves, and the cardioinhibitory centers decrease heart activity via parasympathetic stimulation as one component of the vagus nerve. During rest, both centers provide slight stimulation to the heart, contributing to autonomic tone. This is a similar concept to tone in skeletal muscles. Normally, vagal stimulation
Set the Controls for the Heart of the Sun the Controls for the Heart of the Sun" the only Pink Floyd song that features all five band members, though some listeners may not fully discern the guitar tracks as they largely blend in with Richard Wright's keyboards and organs. The song's recording commenced in August 1967, with overdubs recorded in October of that year and in January 1968. In an article reprinted in the Bruno McDonald book "Pink Floyd – Through the Eyes of ...", Waters borrowed the lyrics from a book of Chinese poetry from the Tang Dynasty (which was later identified as the book "Poems of the