Stomach

The stomach is a muscular organ located in the upper abdomen, between the esophagus and the small intestine. It plays a crucial role in the digestive system by breaking down food and allowing the body to absorb nutrients.

Anatomy of the Stomach

The stomach is divided into four main regions: the cardia, fundus, body, and pylorus. It is lined with a layer of mucous membrane, which protects the stomach from its own digestive juices. The stomach also contains three layers of smooth muscle that help to mix and churn food.

Function of the Stomach

The primary functions of the stomach include:

Storage: The stomach can expand to store food and gradually release it into the small intestine for further digestion.
Digestion: The stomach secretes gastric juices, including hydrochloric acid and enzymes, which break down proteins and other food components.
Protection: The stomach's mucous lining protects it from its acidic contents.

Stomach Disorders

Several disorders can affect the stomach, including:

Gastritis: Inflammation of the stomach lining, often caused by infection, alcohol consumption, or certain medications.
Peptic Ulcers: Open sores that develop on the lining of the stomach, often due to infection with Helicobacter pylori bacteria or long-term use of nonsteroidal anti-inflammatory drugs (NSAIDs).
Gastroesophageal Reflux Disease (GERD): A condition in which stomach acid frequently flows back into the esophagus, causing heartburn and potential damage to the esophagus.
Gastric Cancer: Cancerous growth in the stomach, often associated with chronic inflammation or infection with Helicobacter pylori.

Study Guide

To understand the stomach in greater depth, consider the following study guide:

Learn the anatomy of the stomach, including its regions and the structure of its mucous lining.
Understand the process of digestion in the stomach, including the role of gastric juices and the breakdown of food components.
Explore the functions of the stomach, such as storage, digestion, and protection.
Research common disorders of the stomach, their causes, symptoms, and potential treatments.
Consider the impact of lifestyle factors, such as diet, alcohol consumption, and medication use, on stomach health.

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

The resources above cover the following skills:

PHYSICAL SCIENCE (NGSS)

Matter and Its Interactions

Students who demonstrate understanding can:

Use the periodic table as a model to predict the relative properties of elements based on the patterns of electrons in the outermost energy level of atoms.

Plan and conduct an investigation to gather evidence to compare the structure of substances at the bulk scale to infer the strength of electrical forces between particles.