Grana stacks are made of disk like structures piled on top of one another. These disks are called thylakoid disks. The electron transport processes associated with the light reactions of photosynthesis occur in the thylakoids. Stroma is the amorphous material inside the chloroplast. This is where the enzymes of the Calvin cycle are located.
Mitochondria are responsible for aerobic cellular respiration.
There is an outer membrane and an inner membrane system called the cristae. The cristae protrude into the matrix. Cristae are the location for the electron transport processes of the cytochrome chain involved in cellular respiration. Matrix is where the enzymes of the Krebs cycle are located. The ER appears to function as a communications system within the cell and bay be seen to give rise to other members of the system.