TEAS Science: The Digestive System
The digestive system breaks food down into smaller substances that the body can use. Understanding the major organs and their functions can help you prepare for anatomy and physiology questions on TEAS Science.
Where Digestion Begins
Digestion begins in the mouth. Teeth mechanically break food into smaller pieces, while saliva begins the chemical digestion of certain nutrients. The tongue also helps move food and form it into a bolus for swallowing.
The Esophagus
After swallowing, food travels through the esophagus toward the stomach. The movement of food is helped by muscular contractions called peristalsis.
The Stomach
The stomach stores and mixes food. It also contains substances that help break down food, particularly proteins. The partially digested material then moves into the small intestine.
The Small Intestine
The small intestine is a major site of digestion and nutrient absorption. Its lining contains structures called villi, which increase the surface area available for absorption. Nutrients can then enter circulation and be transported throughout the body.
The Liver, Gallbladder, and Pancreas
Several organs help digestion even though food does not travel through them in the same way. The liver produces bile. The gallbladder stores and releases bile. The pancreas produces digestive enzymes and other substances that help digestion.
The Large Intestine
The large intestine absorbs water and electrolytes from the remaining material. The remaining waste eventually moves toward the rectum and is eliminated from the body.
Study the Process as a Sequence
Instead of memorizing isolated organs, practice the pathway: Mouth → Esophagus → Stomach → Small Intestine → Large Intestine → Rectum Then study the accessory organs separately.
Final Takeaway
For TEAS Science, understand both the sequence of the digestive tract and the function of the major organs. Connecting each organ to its role can make anatomy questions easier to remember.
