Biology question

[Jaged]

Originally Posted by EarlyDawn

But once again, as he explained, your core is naturally warm. Why do you think you feel cold on your feet, hands, and head first, instead of your chest or pelvic reigon? Because they're not nautrally heated with the same degree of efficiency as your torso.

That is exactly my point. What you described earleir is caused by your body drawing blood from your extremities into your core to keep it warm. The nose is an extremity, and therfore should have blood drawn away from it to heat your core. This would make it cold, wich makes sence because your nose does get cold quickly. This does not explain why it gets red though. Redness is usualy caused by excess blood, not lack of it.

[Incompetent]

Yeah but your forgetting the most important point, all your blood is going through your heart anyway, and it's constantly in motion. If your heart just freezes solid before everything else falls off, there is something seriously wrong with your heart.

And if you didn't have any fingers, up until very recently, your effectively dead, it's just slower.

[Jaged]

Well yes thats true your heart isnt going to freeze very fast, but there are other vital organs in your chest. Another thing I forgot to mention is that the body likes to maintain a constant temperature. Even if things don't freeze, if your core gets too cold its not good. It is a scientific fact that the body draws blood into its center when cold. It wants to keep the temperature the same to maintain homeostasis.

Then again it is possible that what our teacher told us was wrong. I do want more proof before I call her on it though.

[ZeusCali]

i think the body trys to keep the skin warm so that it has a barrier against the cold. But when it becomes very cold it retreats from the skin to the core of the body. Hence the blue in the skin of the blood retreating lol.

Oh wait i just thought of something. Oxygen! your body's way of keep the lungs warm is by having the nose heat it up a little bit before pumping it into the lungs. that's why it's always better to breath through the nose rather then the mouth. SO if the nose got cold then the lungs would get cold. And you'd die.
hmm?

[Incompetent]

IIRC it draws blood away from the skin most places, such as your legs, most of your arms, abdomen, ect, and sinks that deeper to avoid heat loss, but your body isn't stupid, it likes having fingers, and toes and a sense of smell, because lacking them has historically been fatal, it's not going to sacrifice them unless it has too.

[Jaged]

Originally Posted by Incompetent

IIRC it draws blood away from the skin most places, such as your legs, most of your arms, abdomen, ect, and sinks that deeper to avoid heat loss, but your body isn't stupid, it likes having fingers, and toes and a sense of smell, because lacking them has historically been fatal, it's not going to sacrifice them unless it has too.

Then explain why your fingers, toes and nose are the first to get cold when the outside temperature drops.

Originally Posted by ZeusCali

i think the body trys to keep the skin warm so that it has a barrier against the cold. But when it becomes very cold it retreats from the skin to the core of the body. Hence the blue in the skin of the blood retreating lol.

Oh wait i just thought of something. Oxygen! your body's way of keep the lungs warm is by having the nose heat it up a little bit before pumping it into the lungs. that's why it's always better to breath through the nose rather then the mouth. SO if the nose got cold then the lungs would get cold. And you'd die.
hmm?

That is a possibility. However it would make more sence to heat up your wind pipe inside your body so as not to loose heat through your nose.

[Incompetent]

Because they have alot of relative surface area to lose heat.

[Jaged]

Originally Posted by Incompetent

Because they have alot of relative surface area to lose heat.

How do your fingers, noes and toes have more surface area then any other part of your body. These parts of your body get cold due to the fact that they are far away from your core.

[Incompetent]

RELATIVE SURFACE AREA, your fingers aren't very big, but they have alot of surface area for there size, and lose heat relatively quickly for there size, but compared to the amount of heat your head loses, it's nothing. Combine that with the fact that traditionally, if you couldn't carry your weight, you got left behind, and keeping your fingers becomes a really fucking good investment.

[Kyonye]

there is a reason why blood is rushed to your nose. yes, it's trying to keep your nose warm, and for this reason. when you breathe in through your nose, the heat from the inside of your nose warms up the cold air before it gets to your lungs. if your nose is cold, there is no heat to warm up the air. thats why they always things like "wear a scarf when its cold out" because you are trying to keep your neck warm so constant heat is keeping the air, you breathe in, warm. this is the only reason i can think of because when i took my evolution class last semester, she talked about nose differences. Africans have wider noses because they come from a warmer climate, so they can take in more air. the reason people, whose ancestors come from a colder climate, have thinner noses, is to be able to warm up the air before entering your lungs. this is also the reason why black people HATE the cold..i'm sure there are a few exceptions but I haven't met one yet.

hope this answers your question.

[Infernus]

I hate biology...

I always thought it was because cold air chapped your skin.

[Jaged]

Originally Posted by Kyonye

there is a reason why blood is rushed to your nose. yes, it's trying to keep your nose warm, and for this reason. when you breathe in through your nose, the heat from the inside of your nose warms up the cold air before it gets to your lungs. if your nose is cold, there is no heat to warm up the air. thats why they always things like "wear a scarf when its cold out" because you are trying to keep your neck warm so constant heat is keeping the air, you breathe in, warm. this is the only reason i can think of because when i took my evolution class last semester, she talked about nose differences. Africans have wider noses because they come from a warmer climate, so they can take in more air. the reason people, whose ancestors come from a colder climate, have thinner noses, is to be able to warm up the air before entering your lungs. this is also the reason why black people HATE the cold..i'm sure there are a few exceptions but I haven't met one yet.

hope this answers your question.

That makes more sence then any post so far. However wouldnt most of the heating of air happen in your nasal passages and tracheia (spelling?) then the flabby piece of flesh outside your body?

[Jaged]

Originally Posted by Infernus

I hate biology...

I always thought it was because cold air chapped your skin.

Anytime youir skin turns red, be it sun burn, a cut, cold temperatures or being chapped it is because blood is rushing to that part of your skin.

edit: double post, sry

[Infernus]

Like I said... Biology blows.

[Jaged]

Originally Posted by Infernus

Like I said... Biology blows.

I love biology. Thats why im trying to figure this out.

Im actualy considering going into the field. Biotechnology in particular is fascinating.