Simplify the following text for a Grade 7 native English-speaking person.
Original: The internal diameter of 8 Î 1\/4 m forces the red blood cells to partially fold into bullet-like shapes and to go into single file in order for them to pass through .
Simplified: The width of 8 Î 1\/4 m forces the red blood cells to partly fold into bullet-like shapes in order to bypass them in single file .