. The Biological bulletin. Biology; Zoology; Marine biology. Figure 5. Simultaneous mechanical records of contractions from both arms of five different isolated hearts showing modes of reversals, (b) contractions of branchial arm; (v) contractions of the visceral arm; (bp) indicates branchial pacemaker activity; and (vp) indicates visceral pacemaker activity. Numbers below records indicate frequency of contraction per minute during a 20-sec. interval. The usual mode of reversal is shown in record 1 which shows a reversal-pause. Records 2 to 5 show variations in pacemaker competition rever
. The Biological bulletin. Biology; Zoology; Marine biology. Figure 5. Simultaneous mechanical records of contractions from both arms of five different isolated hearts showing modes of reversals, (b) contractions of branchial arm; (v) contractions of the visceral arm; (bp) indicates branchial pacemaker activity; and (vp) indicates visceral pacemaker activity. Numbers below records indicate frequency of contraction per minute during a 20-sec. interval. The usual mode of reversal is shown in record 1 which shows a reversal-pause. Records 2 to 5 show variations in pacemaker competition reversals which occurred after a period of time when contraction started at both ends. pacemaker and for the visceral pacemaker. Towards the end of pulsation series, the average frequency of both pacemakers fell to (15° C). The difference in branchial and visceral pacemaker frequencies assures pacemaker com- petition reversals since a phase shift would Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Lillie, Frank Rattray, 1870-1947; Moore, Carl Richard, 1892-; Redfield, Alfred Clarence, 1890-; Marine Biological Laboratory (Woods Hole, Mass. ); Marine Biological Laboratory (Woods Hole, Mass. ). Annual report; HighWire Press. Lancaster, Pa. [etc. ] : Lancaster Press, inc. [etc. ]
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