Type your answer on the lines below, or write it out on paper.
The graph shows the total surface area of the folded inner membrane of mitochondria per cell in two types of cell. Cell type M is a metabolically very active muscle cell; cell type F is a less active fat-storage cell.
Describe the difference in inner mitochondrial membrane surface area between the two cell types.
Suggest how the larger membrane surface area in cell M is linked to its high level of activity.