Human Variation : Cold Climates

BRRR It's Cold in Here 

1. The negative impacts on the survival of humans homeostasis in cold climates  is that there is constant danger of developing hypothermia. Because the body automatically maintains stable core temperature of 98 degrees Fahrenheit. Hypothermia begin when the core temperature reaches 94.F, below 85.F due to the body staying in the cold the body's natural temperature system fails and with this continuous decline in boy temperature can result to death. When the temperature reaches below freezing the body can undergo obtaining a condition called Frostbite.

2. The Short Term Adaptation : In a cold environment our body will quickly respond by shivering, which is a bodily function generating heat to the cold areas on our body. The increased muscle activity in shivering produces more body heat

The Facultative Adaptation : In cold environment we depend on our bodies to produce the internal heat we need, in which the response is to narrow the blood vessels near the skin (vasoconstriction) preserving body heat by reducing blood flow, that's why sometimes our hands become slightly numb. [ if the body remains in the state of vasoconstriction can result into Frostbite]. The body converts from vasoconstriction to vasodilation ,increasing the warm blood flood, to the skins surface in back and forth function to reduce risk for both conditions 

The Developmental Adaptation: People who live in cold environments consume large calories of fattening foods to add extra heat to the body, their body are more round and thick, The thick fat is coated on the vital organs of the chest and abdomen parts of the body, even when heat is loss the core boy temperature remains the same.




The Cultural Adaptation: In cold environments people will be inclined to wear clothing, that does not expose the bare skin and keep their bodies warm, when it gets chilly out we think to wear a jacket to preserve out heat. Eskimos, living in the northern region of the earth, wear heavy stocky clothing, at night they sleep in huddles where they lay their bodies next to each to retain the heat, and remain active outdoors when it's warmer out. In our environment, when it gets cold we use heaters and blankets throughout our homes to keep warm, catering to hot chocolate and  
sitting around the fireplace. each culture have their different ways of with the cold

3. The benefits is that we are learning how other cultures deal with their environments an taking note we can apply that same knowledge to ourselves if we were ever to deal with that kind of situation. Nature is unpredictable and is not always accurate even in a nice warm climate the weather can change a bit and become cold so it is wise to at least take these variations into consideration, being cold for too long can cause a person to become sick if your not dressed warm enough and all can cause the body to deal with abrupt change if not taken care of in these situation. So the benefits is very helpful to obtain this information, who knows you might want to go to a climate where a lot of snow is conducted.

4. The two races I will compare are eskimos and blacks, since my subject is on cold, the northern regions are more suitable for people of white skin because they have little shielding pigmentation and the solar radiations there is weak, whereas blacks will suffer in colder regions because it prevents them from producing Vitamin D. Ultaviolet Radiation must penetrate the skin in order for the body to produce Vitamin , and people in northern climates lack Melanin. The environment is pretty much where it is best appropriate for us and that our skin is adapted to the climate of that area. Its not so much about race when you think about it because if the world were to be under one specific climate we probably would all have the same color of skin. But from the wide variety of climate we differ, this is what nature does and as we adapt to these variations it contributes to our survival in that area. In a sense, natural selection is very convenient for us because where ever we are it suits us best by the reaction of our skin, and that is where we belong in order to live.