12 مصطلحاً في مادة نظام القلب والدورة الدموية مع تعريفات مبنية من المنهج المقرّر — كل مصطلح مربوط بدرسه.
The capacity of specialized cardiac cells to initiate electrical impulses without requiring an external nerve impulse for every beat.
A change in membrane potential that initiates or propagates electrical activation.
The period during which a chamber relaxes and can fill.
A defined electrical viewpoint calculated from electrodes; a lead is not the same thing as an electrode.
End-diastolic volume: ventricular volume immediately before ventricular systole.
End-systolic volume: ventricular volume remaining after ejection.
A measured span that includes at least one wave and may include an adjacent segment.
A phase in which ventricular pressure changes while volume remains constant because all valves are closed.
The return of membrane potential toward its resting state after activation.
The portion of an ECG tracing between named waves.
The volume ejected by one ventricle in one beat; SV = EDV − ESV.
The period during which a chamber contracts.