|
|
| a thin membrane (a double layer of lipids) enclosing the cytoplasm of a cell; proteins in the membrane control passage of ions (like sodium or potassium or calcium) in and out of the cell | |||
|
|
| a pliable sheet of tissue that covers or lines or connects the organs or cells of animals or plants | |||
|
|
| a thin pliable sheet of material |