I'm not quite sure but I would advise, if you're not sure, and your interested to find out ask your local doctor if it is a concern to you.
Extracellular environment
Both eukaryotic cells and prokaryotic cells have a plasma membrane.
do animal have a plasma membrane
it is plasma
The only time a cell would be entering the plasma membrane would be with a white blood cell. The process is called phagocytosis, a form of endocytosis.
Extracellular environment
ALL CELLS HAVE a plasma membrane
Both eukaryotic cells and prokaryotic cells have a plasma membrane.
do animal have a plasma membrane
Plasma membrane is the same as "cell membrane" it's one of the four characteristics of all cells. So plasma membrane is found "coating" the outside of all cells.
Plasma Membrane are the phospholipids most likely found in a prokaryotic cell.
The concentration of potassium within red blood cells is much higher than in the surrounding plasma or serum
it is plasma
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The cell membrane is the outer boundary of animal cells and plant cells, but plant cells also have a cell wall to protect their cells. The cell membrane and cell walls are the outer boundaries of cells.
The only time a cell would be entering the plasma membrane would be with a white blood cell. The process is called phagocytosis, a form of endocytosis.
Plasma membranes isolated from a red blood cell will not be contaminated with internal cell membrane (i.e. membrane from cell organelles - small structures found within cells) because red blood cells do not contain any organelles, so there will be no 'internal membrane' to contaminate.