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( Medicare paid for 20.7 % of heart transplants and 11.5 % of liver transplants in 1998 . " At the heart of both , " writes Mr. Noble , " was the production and distribution of pre-packaged courses of instruction , educational commodities bought , sold , and serviced through the mail . Four years after the mad-cow scare that saw les abats banished from menus , the French are going head over heels for them - - organ meats and other infelicitously named " off-cuts , " including tripe , kidney , sweetbread , calf 's head , pig 's foot , heart , and testicle . Students listen to heart sounds and relate the sounds to the function of the heart chambers . It is also possible to create one 's own layout class ( although this is not for the faint of heart ) or to eschew any formalized layout altogether and place one 's components at absolute ( x , y ) coordinates .