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 review for "A Saucerful of Secrets", Jim Miller of "Rolling Stone" described "Set the Controls for the Heart of the Sun", along with "Let There Be More Light", as "boring melodically, harmonically, and lyrically." Miller further described the production work as "not as glittery as the first album's, and the instrumental work is shoddy and routine. Miller also described the track as too long. Pink Floyd performed the song from 1967 to 1973. A performance on 9 September 1967 featured Barrett and Waters switching guitars. The last ever performance of the song by Pink Floyd took place on 13 October