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 blood is filtered by the spleen, another example of encapsulated lymphoid tissue. This is the body's largest lymphatic organ. It is important for antibody production, facilitating immune responses to blood borne antigens, and it also eliminates worn-out blood cells and platelets.