We
only have a few basic needs as humans, but they are VITAL and when
they're absent, it triggers survival mode for us, better known as
flight, fight or freeze, wherein your sympathetic nervous system
kicks in and prepares you for survival. Your digestion stops, your
libido drops, your platelets thicken just in case you need to clot
your blood quickly (yes, your body is this smart). Your heart rate
quickens, blood pressure shoots up and specific hormones are
secreted like cortisol and adrenaline.