At temperatures below 0 degrees Celcius (43 F) your blood vessels that are close to the skin start to constrict. This is your body’s way of conserving its core temperature but if you are exposed to extreme temperatures for too long, the consrtiction of the blood vessels becomes dangerous as it restricts blood flow. Eventually, this leads to freeszing and or death of various skin tissue. Frostbite often occurs on fingers and toes because they are the furtherst away from the heart which pumps your blood.
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