Cell membrane. Artwork of a section through a cell plasma membrane and three types of ion channel. A sodium ion channel (lower centre), a calcium ion channel (upper right) and a potassium ion channel (upper left) control the passage of ions into and out of the cell. This leads to the build up of electric charge potentials, of vital importance in muscle and nerve tissue. The membrane consists of a double layer of phospholipids (purple/orange).
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