I can understand how if you are not circulating enough (warm) blood, by not moving much while in a cold environment, your extremities themselves lose heat, and become cold - but I don't understand how they (the hands, feet, and head) can make the rest of your body lose heat too.
'Drawing the heat out of your body' (as people have termed it to me) doesn't make sense itself - what is the actual mechanism(s) behind the (exposed, relatively uncirculated) extremities, 'drawing' heat out of the body?
Is it that it merely draws the need to heat those (poorly insulated, circulated) extremities from the existing distribution of heating the other parts of your body, thus lowering how warm those other parts are?
If so, how does that happen? In the case above, where you're not moving the body to circulate warm blood to the hands (or using other warming stimuli like friction), how would 'heat transfer' to the hands occur then? Or does it just indeed slowly 'lose heat' and get colder and colder (which would then lead me back to my question, how would that explain the rest of your body becoming colder as a result of the extremities becoming colder)?