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Ion concentrations and osmolality of luminal fluid along the digestive tract of eel. Ion concentrations of eel plasma and of seawater are also shown
| Segment | Osmolality (mOsm/l) | Na+ (mM) | *K+ (mM) | Cl- (mM) | HCO3- (mM) | Mg2+ (mM) | Ca2+ (mM) | SO42- (mM) |
|---|---|---|---|---|---|---|---|---|
| Esophagus | 449 | 211 | 10 | 225 | - | 40 | 8 | - |
| Stomach | 460 | 222 | 14 | 255 | - | 41 | 10 | - |
| Intestine | 295 | 40 | 14 | 68 | 100 | 150 | 12 | 133 |
| Rectum | 300 | 4 | 11 | 59 | 105 | 188 | 14 | 105 |
| SW | 1029 | 450 | 10 | 524 | 2 | 50 | 10 | 30 |
| Plasma | 377 | 175 | 4 | 155 | 14 | 3 | 2 | 1 |
