The role of the yolk sac in early gestation is to supply the embryo with oxygen and nutrients until the formation of the placenta is accomplished. The yolk sac is also the first site of ...
Connecting structure is the placenta, consisting of embryonic and maternal tissues, and allowing nutritional, respiratory and excretory exchange of material by diffusion between embryonic and maternal ...
Connecting structure is the placenta, consisting of embryonic and maternal tissues, and allowing nutritional, respiratory and excretory exchange of material by diffusion between embryonic and maternal ...
Some results have been hidden because they may be inaccessible to you
Show inaccessible results
Feedback