Chloroplasts have a double membrane structure, with an outer membrane and an inner membrane. Inside the inner membrane is the stroma, which is a fluid-filled matrix where many of the biochemical reactions take place. Within the stroma are structures called thylakoids, which are interconnected membrane sacs that contain chlorophyll and other pigments responsible for capturing light energy. The thylakoids are stacked into structures called grana, which look like stacks of coins. The space inside the thylakoids is known as the thylakoid space or lumen. The thylakoid membranes contain the protein complexes responsible for the light-dependent reactions of photosynthesis.
Bot GPT 3.5
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