No, we do not have two livers; we only have one.
The human body has several organs that occur in pairs, like kidneys, ovaries, testes, and eyes, which are formed from somites. However, the liver, stomach, and thyroid are different. These single organs develop from the gut tube, a structure also associated with the streak during embryonic development. As stated by the provided information: "We only have one liver, stomach and thyroid because these develop from the gut tube...". While we have only one heart, it begins as two organs that later fuse together. This difference in developmental origin explains why some organs appear in pairs, while others do not.
| Organ | Number in Body | Developmental Origin |
|---|---|---|
| Liver | 1 | Gut Tube |
| Stomach | 1 | Gut Tube |
| Thyroid | 1 | Gut Tube |
| Kidneys | 2 | Somites |
| Ovaries/Testes | 2 | Somites |
| Eyes | 2 | Somites |
| Heart | 1 (fused) | Initially 2, fuses |
Therefore, based on the provided reference, a human has just one liver.
