The thylakoid membranes of a chloroplast is an internal system of interconnected membranes, that carry out the light reactions of photosynthesis. They are arranged into stacked and unstacked regions called grana and stroma thylakoids, respectively, that are differentially enriched in photosystem I and II complexes. read more
The grana are connected by stromal thylakoids, which are basically structures that connect to the bottom of the thylakoid and resemble a tunnel. The membrane of the thylakoid divides the surrounding chloroplast into two spaces: the thylakoid space and the stroma. read more
The function of a thylakoid is to serve as the compartment where the light-gathering reactions of photosynthesis occur, as explained in "Molecular Biology of the Cell." It is located in the stroma of the choloroplast, which is the space found between the inner membrane and the thylakoid membrane. read more