Duodenum

The duodenum is the first part of the small intestine and is the shortest segment of the small intestine. It plays a crucial role in the digestion process by receiving partially digested food from the stomach and mixing it with digestive juices from the pancreas and gallbladder.

Anatomy of the Duodenum

The duodenum is divided into four parts: the superior part, descending part, horizontal part, and ascending part. It is connected to the stomach at the pyloric sphincter and leads into the jejunum, the second part of the small intestine.

Functions of the Duodenum

The main functions of the duodenum include:

Receiving partially digested food from the stomach
Neutralizing stomach acid with bicarbonate from the pancreas
Stimulating the release of digestive enzymes from the pancreas and bile from the gallbladder
Continuing the digestion of carbohydrates, fats, and proteins
Absorbing nutrients such as iron, calcium, and magnesium

Duodenal Ulcers

Duodenal ulcers are open sores that develop on the lining of the duodenum. They can be caused by the bacterium Helicobacter pylori, chronic use of nonsteroidal anti-inflammatory drugs (NSAIDs), excessive acid production, and smoking. Symptoms may include abdominal pain, bloating, nausea, and vomiting.

Study Tips

When studying the duodenum, it's important to focus on its anatomy, functions, and common disorders such as duodenal ulcers. Use diagrams to understand its structure and location in the digestive system. Additionally, familiarize yourself with the processes of digestion and absorption that occur in the duodenum.

◂Chemistry Worksheets and Study Guides High School. Atomic Structure - Set I

Worksheet/Answer key

Atomic Structure - Set I

Worksheet/Answer key

Atomic Structure - Set I

Worksheet/Answer key

Atomic Structure - Set I

The resources above cover the following skills:

Concepts of Physical Science (SB1, SB2, SB3, SB4)

The student demonstrates an understanding of the structure and properties of matter by describing atoms and their base components (i.e., protons, neutrons, electrons).

The student demonstrates an understanding of the interactions between matter and energy and the effects of these interactions on systems by recognizing that atoms emit and absorb electromagnetic radiation.

Concepts of Physical Science (SB1, SB2, SB3, SB4)

The student demonstrates an understanding of the structure and properties of matter by using the periodic table to describe atoms in terms of their base components (i.e., protons, neutrons, electrons).