The INDIVIDUAL SACS formed by the inner membrane are called thylakoids and are arranged in stacks like pancakes.
Explanation:
The compartments in between cyanobacteria and chloroplasts, which is linked to the membrane, a sack like structure, understood as a Thylakoids. It is a mattress-like membranous architect that act as location of light-dependent photosynthesis processes.
This is the spot where the chlorophyll used to absorb radiation and use it for biochemical mechanisms. They are organized in stacked and unstacked areas, named as grana and stroma thylakoids, which are enriched differently in complexes of photosystems I and II.
