It incorporated a re-entry body (capsule) for landing scientific instruments and test objects. It was a biological satellite that made a sustained biomedical experiment through the Van Allen radiation belts with the dogs Veterok and Ugolyok.
This spacecraft had a capsule designed to land scientific equipment and test objects upon re-entry.  It was a biological satellite that carried out a long-term medical study in the Van Allen radiation belts, using dogs Veterok and Ugolyok as subjects.