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Electrical activity of the heart
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activity alterations aorta aortic apparent arterial pressure arterioles atrial beats becomes block blood flow blood pressure blood volume body capacitance capillary cardiac output carotid cells cerebral changes circulation closed concentration conduction considerably constant contractility contraction coronary curve decrease diastolic difference dilation direction effect equal evident example exercise factors fibers fluid force frequency function given greater heart rate Hence illustrated increase indicates initial interval leads left ventricular length less lower mean measured mechanism muscle myocardial nervous node normal occurs oxygen perfusion period peripheral resistance phase Physiol physiological potential produced pulmonary pump recorded reduction reflex region relative represent resistance resistance vessels response resting result rise shown sinus skin stimulation stroke sympathetic systole tension tion tissue tone tube usually valves varies vascular vasodilation veins venous pressure venous return ventricle ventricular vessels volume wall wave whereas