Which of the following is NOT included in the definition of pluck?

In anatomical terms, "pluck" refers to a collection of specific internal organs that are often removed together during processing in meat production. The traditional components of a pluck typically include the heart, lungs, and trachea. These organs are closely associated with the respiratory and circulatory systems and are essential for their respective functions within the body.

The stomach, on the other hand, is part of the digestive system rather than the respiratory or circulatory systems and is not included in the definition of pluck. This distinction highlights why the stomach is the correct answer for what is not part of the pluck. In practice, pluck is generally reserved for those organs that are vital to breathing and blood circulation, thereby excluding any digestive organs like the stomach from the definition.