Cell is the basic structural unit of the body. Membrane is a structural component that separates intracellular and extracellular environment by means of plasma membrane.
Inside the eukaryotic cell (nucleus having), numerous “cell organelles” such as endoplasmic reticulum, nucleus, Golgi apparatus and microtubules are present, which serve various functions.
Thus, the blanks can be filled with cell membrane, nucleus, endoplasmic reticulum, Golgi apparatus and microtubules.