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sinoatrial node

sinoatrial node (SA node) (sy-noh-ay-tri-ăl) n. the pacemaker of the heart: a microscopic area of specialized cardiac muscle located in the upper wall of the right atrium near the entry of the vena cava. Fibres of the SA node contract at around 70 times per minute. Following each contraction, the impulse spreads along connecting fibres to the atrioventricular node. Impulses arriving at the SA node accelerate or decrease the heart rate.

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"sinoatrial node." A Dictionary of Nursing. . Encyclopedia.com. 22 Aug. 2017 <http://www.encyclopedia.com>.

"sinoatrial node." A Dictionary of Nursing. . Encyclopedia.com. (August 22, 2017). http://www.encyclopedia.com/caregiving/dictionaries-thesauruses-pictures-and-press-releases/sinoatrial-node

"sinoatrial node." A Dictionary of Nursing. . Retrieved August 22, 2017 from Encyclopedia.com: http://www.encyclopedia.com/caregiving/dictionaries-thesauruses-pictures-and-press-releases/sinoatrial-node

sinoatrial node

sinoatrial node See pacemaker.

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"sinoatrial node." A Dictionary of Biology. . Encyclopedia.com. 22 Aug. 2017 <http://www.encyclopedia.com>.

"sinoatrial node." A Dictionary of Biology. . Encyclopedia.com. (August 22, 2017). http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/sinoatrial-node

"sinoatrial node." A Dictionary of Biology. . Retrieved August 22, 2017 from Encyclopedia.com: http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/sinoatrial-node