The human foetus after 10 weeks,showing the legs & feet (note development of the toes),& the spiralling umbilical cord carrying the blood vessels which exchange nourishment (ie oxygen) & waste products with the maternal circulation. The umbilical cord is joined to the foetus on the abdomen (the navel),& to the uterine wall (endometrium) via the placenta,an organ which interfaces the 2 circulatory systems. The role of the placenta is complex: apart from acting as a filter,it performs as a multiple organ system during early development. It also supports the mother by synthesising a range of hormones (in a similar fashion to the pituitary gland) | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / Edelmann |
Bildgröße: | 4535 px × 3095 px |
Modell-Rechte: | nicht erforderlich |
Eigentums-Rechte: | nicht erforderlich |
Restrictions: |
|