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.
Photosynthesis requires sunlight, carbon dioxide, and water as starting reactants ([Figure 4]). After the process is complete, photosynthesis releases oxygen and produces carbohydrate molecules, most commonly glucose.
They can use a technique called Polymerase Chain Reaction. This can be done in a test tube or even in a organism. It usually relies on something called Thermostable DNA Polymerase and Taq polymerase. It requires DNA primers that is designed specifically for that DNA region (interest).
there is so much water in the ocean, and 100 degres isnt quite boiling point. and the ocean is so big that even if there was one part of the world where it got hot enough boil and possably evaporate, the colder parts of the world still wouldnt.
