Imagine that you are outside on a cold day and have removed your gloves to answer your phone. Which statement is true regarding
the blood vessels (directly below the surface of your skin) in your ungloved hands?a. As a result of vasodilation, these blood vessels have expanded or increased in diameter, thereby increasing amount of heat your hands are losing to the environment.b. As a result of vasodilation, these blood vessels have shrunk or contracted in diameter, thereby reducing the amount of heat your hands are losing to the environment.c. As a result of vasoconstriction, these blood vessels have shrunk or contracted in diameter, thereby reducing the amount of heat your hands are losing to the environment.d. As a result of vasoconstriction, these blood vessels have expanded or increased in diameter, thereby increasing the amount of heat your hands are losing to the environment.e. There will be no change in these blood vessels; their diameter will remain the same as when you had your gloves on.
Mammals are warm-blooded animals that are they need to maintain the internal temperature irrespective of the external temperature at a constant rate or 37° C.
In cold conditions the person exposing the body parts to cold conditions response either by producing heat or conserving the heat in the body.
If a person removes the gloves, then a physiological change leads to the change in the diameter of the blood vessels. The diameter of the blood vessels reduces which reduces the loss of heat from the body as constriction of the blood vessels decreases the surface area to be exposed to cold conditions.
<span>This is a positive feedback. These episodes make the next glacial period even more severe and long-lasting than the one prior. This is due to the reflectance of the surface of the land having a positive relationship with how much energy is absorbed: as the reflectance increases, absorption decreases, and the glacial period increases in severity.</span>
Pyruvate is first converted to acetaldehyde by enzyme pyruvate decarboxylase in the presence of Thiamine pyrophosphate and Mg ++. Carbon-dioxide is released during this reaction.
One effect of wind currents has to do with the weather, as the wind travels over water it collects moisture, the vapor in the air then condenses as it reaches colder climates and generally causes heavy rainfall.
