Amphibians have gills when they are young or they breathe through their skin. Adult amphibians either have lungs or continue to breathe through their skin.Amphibians have three ways of breathing. The first is with gills, seen on tadpoles and salamanders that do not leave the water. The second isâ¦.
Embryology is the branch of developmental biology that studies the beginning and early growth of sexually reproducing organisms. This life science specialty focuses primarily on embryogenesis (the formation and development of embryos). In humans, the term embryo is traditionally reserved for the first two months of development. After that point, the term âembryoâ is replaced by the term âfetus,â which then applies until birth. At the beginning of the individualâs development, the entity is a single cell. After two months, it has limbs, distinct fingers and toes, internal development, and countless cells.
Medical Definition of Autologous. Autologous: In blood transfusion and transplantation, a situation in which the donor and recipient are the same person. Patients scheduled for non-emergency surgery may be autologous donors by donating blood for themselves that will be stored until the surgery. An autologous graft is a graft (such as a graft of skin) that is provided for oneself.