Gastric cells are specialized cells located in the lining of the stomach. They play a crucial role in digestion by producing various substances, including gastric acid and digestive enzymes. The main types of gastric cells include parietal cells, which secrete hydrochloric acid, and chief cells, which produce pepsinogen, an enzyme that helps break down proteins. These cells work together to create an acidic environment in the stomach, which is essential for proper digestion. Additionally, mucous cells produce mucus to protect the stomach lining from the harsh effects of gastric acid. Overall, gastric cells are vital for effective food processing and nutrient absorption.