USGS Map: Chinook Pass 7 1/2. Chinook Pass Falls is located near Tipsoo Lake on the east side of Mount Rainier National Park. From the junction of Highways 410 and 123 at Cayuse Pass, follow Highway 410 east toward Chinook Pass and Yakima for just over a mile and park in the small pull out at the first switchback.
Constriction of blood vessels means that there is less heat radiated to the environment. This is why prolonged cold can lead to frostbite- the fingers and toes don't get enough blood sent to them and the tissues begin to die. Blood vessels dilate to radiate heat to the environment. Due to Homeostasis (maintanance of the internal environment) when your too cold, your blood vessels constrict to preserve heat which makes blood flow slower. when your warm, your blood flows better and mroe heat is released.
What do blood vessels have to do with the skin regulating body temperature? They are near the surface of the skin, which allows your body heat to be released from the blood and out through the skin. If there is more heat that needs to be released, then there is more blood in the blood vessels.