SIMPLIFIED DIGESTIVE SYSTEM ANATOMY
A Study Guide for Health Science Students
Prepared by
Basira.
1. Introduction
The digestive system is a group of organs that work together to break down food into simpler
substances that the body can use. Through digestion, nutrients are absorbed into the bloodstream and
used for energy, growth, and repair of tissues. Waste materials that cannot be used by the body are
removed as feces.
2. Functions of the Digestive System
The digestive system performs several important functions. These include ingestion of food, digestion
of food through mechanical and chemical processes, secretion of digestive juices, absorption of
nutrients into the blood or lymph, movement of food along the gastrointestinal tract, and elimination
of undigested waste materials from the body.
3. Organs of the Digestive System
The digestive system is made up of the gastrointestinal tract and accessory digestive organs. The
gastrointestinal tract is a continuous tube extending from the mouth to the anus and is responsible for
digestion and absorption of food.
Digestion begins in the mouth where food is chewed and mixed with saliva. The pharynx and
esophagus transport food to the stomach. In the stomach, food is mixed with gastric juices which
begin protein digestion. The small intestine is the main site of digestion and absorption of nutrients,
while the large intestine absorbs water and forms feces.
Accessory digestive organs include the teeth, tongue, salivary glands, liver, gallbladder, and pancreas.
These organs assist digestion by mechanical action or by producing digestive secretions.
4. Layers of the Gastrointestinal Tract
Most parts of the gastrointestinal tract consist of four basic layers. The mucosa is the innermost layer
and is involved in protection, secretion, and absorption. The submucosa supports the mucosa and
A Study Guide for Health Science Students
Prepared by
Basira.
1. Introduction
The digestive system is a group of organs that work together to break down food into simpler
substances that the body can use. Through digestion, nutrients are absorbed into the bloodstream and
used for energy, growth, and repair of tissues. Waste materials that cannot be used by the body are
removed as feces.
2. Functions of the Digestive System
The digestive system performs several important functions. These include ingestion of food, digestion
of food through mechanical and chemical processes, secretion of digestive juices, absorption of
nutrients into the blood or lymph, movement of food along the gastrointestinal tract, and elimination
of undigested waste materials from the body.
3. Organs of the Digestive System
The digestive system is made up of the gastrointestinal tract and accessory digestive organs. The
gastrointestinal tract is a continuous tube extending from the mouth to the anus and is responsible for
digestion and absorption of food.
Digestion begins in the mouth where food is chewed and mixed with saliva. The pharynx and
esophagus transport food to the stomach. In the stomach, food is mixed with gastric juices which
begin protein digestion. The small intestine is the main site of digestion and absorption of nutrients,
while the large intestine absorbs water and forms feces.
Accessory digestive organs include the teeth, tongue, salivary glands, liver, gallbladder, and pancreas.
These organs assist digestion by mechanical action or by producing digestive secretions.
4. Layers of the Gastrointestinal Tract
Most parts of the gastrointestinal tract consist of four basic layers. The mucosa is the innermost layer
and is involved in protection, secretion, and absorption. The submucosa supports the mucosa and
