When you are hot, blood vessels in the dermis in order to maintain homeostasis?

When a person is hot, the blood vessels in the dermis dilates, in order to maintain the homeostasis. When the temperature is increased, it becomes necessary to lose the body heat. This increased heat is lost by rushing the blood to the vessels present in the dermis layer. These blood vessels dilates so that more blood can flow inside these and the heat can be lost.

hence, the blank can be filled with 'dilate'.

they deliver oxygen to the blood

igneous rocks are formed by solidification of cooled magma (molten rock), with or without crystallization, either below the surface as intrusive (plutonic) rocks or on the surface as extrusive (volcanic) rocks.  

the composition depends on the source magma. there are almost a thousand types of composition found till now.  

hope this