"Runny" nose and nosebleeds

I'm sure all of us have been experienced in ''runny" nose while exposed to cold air. Do you had ever think why it is happen? In our nasal cavity, there are ciliated cells structured of the respiratory mucosa which create a gentle current that moves the sheet of contaminated mucus posteriorly toward the throat where it is swallowed and digested by stomach juices. When exposed to cold air, our nasal cilia become sluggish, allowing mucus to accumulate in the nasal cavity and then dribble out the nostrils. Together along with the fact that water vapour in expired air tends to condense at these lower temperature help explain why you might had "runny" nose on a crisp. On the other hand, rich plexuses of capillaries and thin-walled veins underlie the nasal epithelium and warm incoming air as it flows across the mucosal surface. When the inspired air is cold, the vascular plexus becomes engorged with blood, thereby intensifying the air-heating process. How great The Creator? If we don't have this mechanism, can you imagine how will you look like when you inhale -4°C air into your lung in certain country during winter? However, during hot day, some of us might had experienced nosebleeds because of the abundance of blood vessels at this area dilate and get nearer to the surface in order to loses some heat. There are possibilities that some of the blood vessels burst and cause bleeding.