Neutrophils are the most common type of white blood cell, comprising about 50-70% of all white blood cells. They are phagocytic, meaning that they can ingest other cells, though they do not survive the act. Neutrophils are the first immune cells to arrive at a site of infection, through a process known as chemotaxis.
One of the basic theories stipulates that increasing interest rates raise consumers' and manufacturers' costs, which, in turn, reduces the amount of time and money people spend driving. Less people on the road translates to less demand for oil, which can cause oil prices to drop.
If U.S. onshore oil production keeps growing, the extra supply could hold down oil prices and pull down prices at the pump. U.S. consumers are expected to pay $25 billion more for gasoline this year as fuel prices hit their highest sustained levels in four years, according to annual projections.