A muscular pump supporting blood circulation. Electrical activity, mechanical contraction and perception of heartbeat-related signals are distinguishable measurements.
The recurrent sequence of contraction and relaxation during a heartbeat. Electrical activity, mechanical contraction and sensory afferent signals have related but different timings.
The relaxation and filling phase of a cardiac cycle. In cardiac-phase experiments it provides a comparison period with different baroreceptor signalling.
The contraction phase of a cardiac cycle; ventricular systole includes ejection of blood. Timing a stimulus to systole can change its relation to cardiovascular afferent signals.

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