Why do you think neutrophils are not present in the tissues during homeostasis even though they constitutively express the selectins and integrins necessary to enter tissues?

Though the neutrophils constitutively express selectins and integrins, the P-/E-selectin and ICAMS (intercellular adhesion molecules) are only articulated on the vascular endothelium at the locations of inflammation.  

Or it can also be said that while the neutrophil adhesion molecules are constitutively expressed, the vascular endothelial adhesion molecules are induced.  

the most common energy conversion is from kinetic energy to potential energy, and then from potential energy to kinetic energy.

later on comes the heat energy, mechanical energy, and other energy conversions.

this energy conversion is so common that we can find it in our day to day lives as well.

- one of the most common energy conversions involves the changing of potential energy to kinetic energy or kinetic energy to potential energy