According to the Einthoven theory, the heart is considered as:

The dependence of metal resistance R on the temperature t is given by the formula

Choose the physiotherapy procedures based on the action of direct current

The amplitude characteristic of an amplifier is the dependence of

Speed of the ECG recording is equal to 25mm/s, length of the QRS complex is 2 mm, length of the ST interval is 6 mm. Determine the duration of  ventricular action potential (in ms).

Pulses are symmetrical if

Thermocouple with the sensitivity of 15 μV/°С generates electromotive force of 0.45 mV. Determine the temperature of measurement junction of the thermocouple if the temperature of reference junction is equal to 10°С.

Specific heat produced in conductive tissue under the UHF-therapy is determined by the formula

The amplitude of the ECG calibration signal is equal to 10 mm when voltage of 1 mV is applied. The height of R wave is 8 mm. Determine the voltage amplitude of this wave (in mV).

Dynamic range of the amplifier falls into the range from U_in1 =0,1 mV to U_in2 =100 mV. Calculate the magnitude of the dynamic range in decibels.