Fact 1: Brain cells die quickly if their oxygen supply is cut off.

Fact 2: Astroglial cells are the most common cells in brain tissue.

Given the two facts above, answer the question "what dies is their oxygen supply is cut off?" with the following options: 
- trees
 - Plant growth is reduced
 - weathering
 - Veins and arteries.
 - Most plants
 - astroglial cells
 - critical organs
 - gravity


 

      astroglial cells   