Army medical examiners were suspicious about the close proximity of the three bullet holes in Pat Tillmanâs forehead and tried without success to get authorities to investigate whether the former NFL playerâs death amounted to a crime, according to documents obtained by The Associated Press.
Membrane. Definition. noun, plural: membranes. (1) (biology) A thin layer of tissue covering a surface or lining a cavity, space or organ. (2) (biology) A cell membrane. (3) (chemistry) A thin pliable sheet of material that is permeable to substances in solution.Supplement. A biological membrane functions by protecting the surface or bodily organ.1) (biology) A thin layer of tissue covering a surface or lining a cavity, space or organ. (2) (biology) A cell membrane. (3) (chemistry) A thin pliable sheet of material that is permeable to substances in solution. Supplement. A biological membrane functions by protecting the surface or bodily organ.
The nucleus is an organelle that is surrounded by a double membrane called the nuclear envelope. The nuclear envelope separates the contents of the nucleus from the rest of the cell. Eukaryotic cells also have a cell membrane (plasma membrane), cytoplasm, cytoskeleton, and various cellular organelles.