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action potential airway ampliﬁer amplitude applied arterial bandwidth biopotential capacitance capacitor cardiac cardiac output cardiac pacemaker cardiotachometer catheter cause cell changes characteristics clinical components connected constant cuff current ﬂows curve deﬁbrillator deﬁned detected detector determine devices Doppler elec electrical electrocardiograph electrodes electrolyte equation equivalent circuit ﬁbers ﬁeld ﬁlm ﬁlter ﬁrst ﬂow ﬂowmeter ﬂuid frequency response function ground heart sounds impedance increases input instrument layer lead wire linear lung volume lungs measure membrane metal microshock monitor muscle nerve noise normal operation output pacemaker patient piezoelectric plethysmograph pneumotachometer problem produce proﬁle pulmonary pulse recording reﬂected resistance respiratory result sample Section sensitivity sensor shown in Figure shows signal skin speciﬁc spirometer stimulation sufﬁcient surface technique temperature thermistor tion tissue transducer transmitted trodes tube ultrasonic velocity venous ventricle vessel voltage volume wave waveform wavelength zero