*
These two cells are of very different sizes: the average hepatocyte has a volume of about 5000 μm3 compared with 1000 μm3 for the pancreatic exocrine cell. Total cell membrane areas are estimated at about 110,000 μm2 and 13,000 μm2, respectively.
 |
| MEMBRANE TYPE | PERCENTAGE OF TOTAL CELL MEMBRANE | |
|---|---|---|
| LIVER HEPATOCYTE* | PANCREATIC EXOCRINE CELL* | |
| Plasma membrane | 2 | 5 |
| Rough ER membrane | 35 | 60 |
| Smooth ER membrane | 16 | <1 |
| Golgi apparatus membrane | 7 | 10 |
| Mitochondria | ||
 Outer membrane | 7 | 4 |
| Inner membrane | 32 | 17 |
| Nucleus | ||
| Inner membrane | 0.2 | 0.7 |
| Secretory vesicle membrane | not determined | 3 |
| Lysosome membrane | 0.4 | not determined |
| Peroxisome membrane | 0.4 | not determined |
| Endosome membrane | 0.4 | not determined |
These two cells are of very different sizes: the average hepatocyte has a volume of about 5000 μm3 compared with 1000 μm3 for the pancreatic exocrine cell. Total cell membrane areas are estimated at about 110,000 μm2 and 13,000 μm2, respectively.