The Digestive System

What are the four tunics of the GI tract? For each organ described below, provide the unique differences in their tunics. Be thorough and specific.
Esophagus
Stomach
Small Intestine
Large Intestine
For each of the differences above, provide 2-3 sentences explaining how these unique differences reflect the function of that organ.
We learned about five accessory organs in the digestive system. Why are they considered "accessory?" For eachof these organs, provide the following information.
Describe their location within the body.
A detailed description of their gross and microscopic anatomical features in 4-6 sentences.
Its function within the digestive system.
How does the digestive system relate to each of the following organs sytems. It may relate in more than one way. Hint: you may want to review the content corresponding to these systems to answer this question.
Cardiovascular System
Lymphatic System
"Immune" System