Why do we hold our breath when we're cold?
912081
Have you ever seen a horror film or police drama where the victim gets locked in a freezer?They always run around or excersise to try and keep warm to stay alive.This is the worst thing you can do because breathing in the cold air chills you from the inside so you can't maintain a core temperature.So probably holding your breath when cold is a natural defense against this.
795780
some of them might hibernate. hibernation allows some small mammals to reduce their metabolism during times of scarce resources, such as winter. they accumulate body fat for a while, then it's like their system «shuts down»: their body temperature decreases, their pulse too, and they might breathe as few as 1 to 10 times a minute!\nhibernation is a real advantage because, when it's cold, it would take a lot more energy to keep normal body heat, consuming more nutrients, when, in fact, it's the time of year when it's more difficult to feed!
283966
YES!! In winter some people who don't even have cold wear masks to prevent getting cold.
919437
It certainly can, but how is slightly unclear, exposure to cold causes your blood vessels and capillaries to constrict(shrink) to prevent heat loss which in turn increases the blood volume in rest of body and possibly making heart work harder and thereby triggering angina.
560458
http://en.wikipedia.org/wiki/Shivering\nShivering is a bodily function in response to cold in warm-blooded animals or the body's perception of cold. When the core temperature of the body drops, the shivering reflex is triggered. Muscle groups around the vital organs begin to shake in small movements in an attempt to create warmth by expending energy. Shivering can also be a response to a fever as a person may feel cold, though their core temperature is already elevated.\n\nOther responses observed in cold people (for example, swimmers emerging from a pool on a cold windy day), are dancing on the spot, hugging oneself with the arms surrounding the torso, huddling together, goose bumps on the skin, and using insulation such as towels.\n\nLocated in the dorsomedial portion of the hypothalamus near the wall of the third ventricle is an area called the primary motor center for shivering. This area is normally inhibited by signals from the heat center in the anterior hypothalamic-preoptic area but is excited by cold signals from the skin and spinal cord. Therefore, this center becomes activated when the body temperature falls even a fraction of a degree below a critical temperature level.
711427
It sure does.  Why do you think athletes dont freeze to death when they play in shorts and a t-shirt in the middle of winter?  More muscle means more blood flow, which means more 98.6 degree blood being sent throughout your body.  Think about this... you shiver when you are cold, which stimulates the muscles, thereby increasing blood flow to your cold areas, and making you feel warmer.
230342
Hold your leg under a firm stream of very cold water because the water is cold your blood vessels wil open and allow enough blood to your legs.
1110638
The reaction is triggered by the contact of a cold substance with the roof of the mouth. It irritates the nerves in the region, causing them to spasm. These nerves cause the blood vessels in the brain to dilate. When this happens you get a brain freeze.
1056429
Because the cold triggers the contraction of the bladder muscle thus enabling you to pee.  Cold contracts and heat expands.
78832
This is one of the most persistent myths about colds. The only way to catch a cold is by being exposed to a cold virus. Cold air may irritate an existing condition, such as asthma, which would weaken your immunity. This could make your body more receptive to a cold virus, but only if you come in contact with it. If you've caught a cold after getting chilled, it's only coincidence. \n\nI hope this will convince your parents. You can get hypothermia from being cold, but that is about it.
298822
your lungs relax, then expand, making it easier to breath.   happens to me at work. I'm a roofer and i have asthma, I'm also afraid of heights[ yeah i don't get it either].anyway when i first go up the ladder in the morning especially on a cold day i get tense, i hyperventilate and breathing is a problem . after a little while i calm down , relax and everything is everything.....
941373
Within limits,as temperature increases,so does the amount of O2 released from the hemoglobin.Heat is a byproduct of the metabolic reations of all cells and the heat released by contracting muscle fibers tends to raise body temperature.Metabolically active cells require more O2 and liberate more acids and heat.The acids and heat, in turn, promote release of O2 from oxyhemoglobin(oxy binded with hemoglobin in blood).\n\nSo, increased in temperature caused the rate of respiration to increase too.Because O2 tends to be released from the hemoglobin compared to when the weather is cold.This explain why during fever,a person will breath faster than normal person.\nIn contrast,during hypothermia(lowered body temperature) cellular metabolism slows and the need for O2 is reduced,and more O2 remains bound to hemoglobin.\n\nPlease check my grammar too.Im sux with my grammar coz English is my 3rd language.So, please check it.Hope this helps ya!
844710
When you're breathing hard you're using your lungs, and your heart is pumping big time.  Be sure to not stop all of a sudden, but cool down eventually so your heart can slow down slowly.
242077
The snow holds pockets of air which act as insulation.Because they are low and round the heat circulates lower in the shelter.The heat is provided by the human body and can be regulated by the individual possessing that body.The igloo also shelters from the elements such as wind chill
715041
stick your head in the freezer and take deep breaths!! the cold air should irratate your throat enough to loose your voice....Well the cold weather does it for me, so that should work??? Then scream alot like everyone else says...
969853
When you sweat your body is trying to cool itself and the sweat creates moisture to cool the skin the blood vessels underneath the skin dialate and release the heat in the blood that then makes your body sweat. When you are cold the blood vessels contrict holding the heat in. and when your hairs stand up that is from the tiny muscles attached conracting, pulling inward helping so heat cant escape, that why you get goosebumps too!
639091
Immediately after hard work (like running) the breath is very very deep, so You can inhale water. \n\nIf Your breath is OK, cold water can make Your heart slow down or even stop, because of coldness. \n\nAt last, You can swallow very large amount of water, which can't pass through the diaphragm hole to the stomach, and a sharp pain in Your chest can occur, which is happening because of expansion of the passage. That expansion can rupture the diaphragm or the passage.\n\nAnyway, it is adviced to drink water before running, but if You have to take some water after running, take it in small swallows, with pauses between, and make sure that the water is at the ambient temperature.