The esophagus is a muscular tube connecting the throat and the stomach. It is lined with a pink tissue called mucosa. The upper part of the esophagus is used to keep food and secretions from going down the windpipe. The lower part helps to prevent stomach contents from moving backward.
INSIDE LIVER AND GALLBLADDER
OUTSIDE THE STOMACH
The stomach is a muscular organ on the left side of the upper abdomen. Rugae, ridges of muscle tissue line the stomach. The stomach secretes acid and enzymes that digest food. Ridges of muscle tissue called rugae line the stomach. The stomach muscles contract periodically, churning food to enhance digestion.
INSIDE THE STOMACH
OUTSIDE THE INTESTINES & MESENTRY
The intestines are a long, continuous tube that go from the stomach to the anus. Most absorption of nutrients and water happen in the intestines. The intestines include the small intestine, large intestine, and rectum. The small intestine absorbs nutrients from food and drinks. The small intestine is divided into the duodenum, jejunum, and ileum. It is lined with velvety tissue. The mesentery is a contiguous set of tissues that attaches the intestines to the abdominal wall. The large intestine (colon) absorbs water from wastes. The rectum releases the waste.
INSIDE THE INTESTINES
OUTSIDE LIVER AND GALLBLADDER
Located in the upper right portion of the abdomen, the liver and gallbladder are interconnected by ducts known as the biliary tract. The liver filters blood coming from the digestive tract, before passing it to the rest of the body and it detoxifies chemicals. The gallbladder is a hollow structure. Its stores and concentrates a digestive enzyme produced by the liver.