4. The skin is the body's major thermoregulatory organ. We control our body temperature by regulating the amount of heat we lose into the environment by changing blood flow to the skin. How does the relationship between the epidermis, dermis, and hypodermis contribute to this function?

The current thought on the structure of the cell membrane is: a. a static phosphate sandwich of lipids b. a fluid-mosaic of phospholipids and proteins c. a bilayer of proteins with static lipid molecules d. an impermeable bilayer of protein molecules e. a static and permeable phospholipid single layer