Since Medco and Express Scripts have come together as one company to manage your prescription drug benefit, the information Medco had on file for you is now available to the merged company.
Frigid winds make you shiver; dry air chaps unprotected lips and hands; and a lack of sunshine can even cause depression. Cold weather also puts immense strain on the heart. Low temperatures cause your blood vessels and arteries to narrow, restricting blood flow and reducing oxygen to the heart. Your heart must pump harder to circulate blood through the constricted blood vessels. As a result, your blood pressure increases. A sudden spike in blood pressure â especially when paired with outdoor exertion, such as shoveling a snowy sidewalk â can cause serious issues such as: 1  Unstable chest pain.
For your question, in cold conditions, the small blood capillaries on the surface of your skin constrict to prevent blood flow to them. Since blood carries body heat, it prevents heat loss through convection, conduction and radiation from the skin surface. Remember that the skin is the biggest organ in our body and hence has the largest surface area, heat can be lost/kept effectively. The reverse happens for warm conditions. The blood vessels dilate and allow blood flow to skin surface and heat is lost through convection, conduction and radiation. A little bit of physics involved: Heat energy travels from an region/object of higher temperature (skin) to a region of lower temperature (surrounding environment).