sinoatrial
Cardiac rhythm initiator
Sinoatrial refers to the sinoatrial node, a small mass of tissue in the right atrium of the heart that generates electrical impulses to initiate each heartbeat.
Often called the heart's natural pacemaker, it sets the rhythm for cardiac contractions: The sinoatrial node was functioning normally.
Usually appears in medical contexts as sinoatrial node or abbreviated SA node.
Rhythmic cardiac contraction
- rateMeasured speed or charge
- regularityConsistent, predictable occurrence
- paceSpeed of movement
- cycleRepeating sequence of events
periodicity · oscillation · timing · initiation · beat · pulse · cardiac cycle · resting rate
Device regulating heartbeat
- arrhythmiaAbnormal cardiac rhythm
- tachycardiaExcessively fast pulse
- bradycardiaAbnormally slow heart rate
- ectopicIn abnormal position
P-wave · electrocardiogram · ablation · dysfunction · heart block · antiarrhythmic
Loss of electrical gradient
- repolarizationMembrane voltage reset
- conductionHeat transfer through contact
- impulseSudden urge to act
- excitationStimulation of response
automaticity · action potential · calcium influx · potassium channels · threshold · refractory period · propagation · hyperpolarization
Connection point in networks
- myocardiumMuscular tissue of heart
- septumInternal anatomical partition
- endocardiumHeart's inner wall covering
- pericardiumMembranous cardiac enclosure
heartbeat
Rhythmic cardiac contraction
- rateMeasured speed or charge
- regularityConsistent, predictable occurrence
- paceSpeed of movement
cycle · periodicity · oscillation · timing · initiation · beat · pulse · cardiac cycle · resting rate · heart rate variability
pacemaker
Device regulating heartbeat
- arrhythmiaAbnormal cardiac rhythm
- tachycardiaExcessively fast pulse
- bradycardiaAbnormally slow heart rate
ectopic · P-wave · electrocardiogram · ablation · dysfunction · heart block · antiarrhythmic
depolarization
Loss of electrical gradient
- repolarizationMembrane voltage reset
- conductionHeat transfer through contact
- impulseSudden urge to act
excitation · automaticity · action potential · calcium influx · potassium channels · threshold · refractory period · propagation · hyperpolarization
node
Connection point in networks
- myocardiumMuscular tissue of heart
- septumInternal anatomical partition
- endocardiumHeart's inner wall covering
pericardium · coronary · atrioventricular · vena cava · cardiac muscle
sinoatrialatrioventricular
Between heart's upper-lower sections
ventricular · ectopic · apical