If we are to imagine being placed inside of a chloroplast, then traveling out into the cytosol, we will have passed through two plasmatic membranes and a handful of structures.
Imagine we are seeing a student shrunken down to the size of a chloroplast. The student in question is placed in the interior of a chloroplast. To know what structures this student would pass through, we analyze the anatomy of a chloroplast which, in broad terms, contains:
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Stroma
- Granum
- Inner membrane
- Outer membrane
These contents have been listed in order from the most interior to the most superficial. We will that the student is placed in the granum, meaning that he is within the inner membrane. In order to escape into the cytosol, which lies just beyond the outer membrane, he must travel across two plasmatic membranes, the granum and the stroma.
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