Pyrexia is triggered by the hypothalamus, a small gland located in the brain and the body's internal thermostat that is activated by pyrogens in the bloodstream. Pyrogens are released into the bloodstream from injured body tissues or from the presence of disease cuasing microorganisms.
The refresh rate your screen is running at will be listed in a little window within a drop down list eg, 60 Hertz, 70 Hertz, 72 Hertz and on uop depending on what your monitor can handle.
Those frames are then interlaced (combined and shuffled) to 60 frames per second to match the 60Hz refresh rate of the vast majority of TVs you can buy today.