Allow the clams enough time to open their shells-this will be indicated by a burst of steam and popped-open shells, anywhere from 2â3 minutes to 5-10 minutes, depending on the type of clams. If some don't open in this time, discard them as they probably were already dead.
Spleen, lymph nodes, adenoids, tonsils are the encapsulated secondary lymphoid organs. Mucosa associated lymphoid tissue distributed throughout the body such as alimentary canal, respiratory and urinogenital tracts etc. are the diffused secondary lymphoid regions.
The thymus and bone marrow are the primary lymphoid tissues. The lymph nodes and the lymphoid follicles in tonsils, skin, spleen, etc. are all secondary lymphoid tissues. Lymph Node. A group of lymphoid tissues is called a lymph node.