Analyse and build this circuit (from page 14 of the AD620 datasheet)

The low current noise of the AD620 allows its use in ECG monitors (Figure 39) where high source resistances of 1 MO or higher are not uncommon.

The AD620's low power, low supply voltage requirements, and space-saving 8-lead mini-DIP and SOIC package offerings make it an excellent choice for battery powered data recorders.

Furthermore, the low bias currents and low current noise, coupled with the low voltage noise of the AD620, improve the dynamic range for better performance.

The value of capacitor C1 is chosen to maintain stability of the right leg drive loop.

Proper safeguards, such as isolation, must be added to this circuit to protect the patient from possible harm.

NOTE: The AD705 IC is a deprecated model 'Picoampere input Current Bipolar Op-amp'.

Q: What is the purpose of the subcircuit between the right leg of the person and the 1 and 8 inputs of the IC. Is it perhaps a variable resistance to make for a variable AD620 amplification?

Q: Why the 0.03Hz High Pass filter? To block DC maybe?

Q: Why does the output say '1V/mV'. Does the output present 1V for every mV at the input?