1. 1  Transportation. 2  Blood is the primary means of transport in the body that is responsible for transporting important nutrients and materials to and from the cells and molecules that make up our body.
Flag Display Guide. Displaying the Flag at Half Mast: When you need to display the American flag at half mast, you actually need to hoist it completely to the peak of the pole and then instantly lower it to the half staff position. At the close of the day, the flag should again be raised to the peak of the flag pole and then lowered completely.
The flag is to be flown at half-staff in mourning for the death of designated, principal government leaders. And after September 11, the flags were at half-staff for 11 days. Source(s): http://en.wikipedia.org/wiki/United_States_Flag_Code