Year 11 Exam > Year 11 Notes > Biology for GCSE/IGCSE > The Stomach
The Stomach | Biology for GCSE/IGCSE - Year 11 PDF Download
The Stomach
- Part of the Digestive System: The stomach is one of several organs that comprise the digestive system. This system's primary function is to break down large, insoluble food molecules into smaller, soluble molecules, which are then absorbed into the body to provide essential nutrients.
- Function of the Digestive System: The digestive system transforms food into a form that the body can utilize. It converts large, complex molecules into smaller, absorbable ones through both physical and chemical processes, ensuring the body receives necessary nutrients.
- Stomach Churning: The lining of the stomach contains muscles that contract to physically squeeze and mix the food with digestive juices, a process known as stomach churning. This action breaks down food into smaller particles and thoroughly mixes it with enzymes and acids, enhancing digestion.
- Digestion Time: Food typically remains in the stomach for several hours, where it undergoes significant digestion. The stomach's acidic environment and digestive enzymes work together to break down food into a semi-liquid form called chyme, preparing it for further digestion and absorption in the intestines.
The Stomach Tissues
Three main types of tissue can be found in the stomach: muscular, epithelial, and glandular. These tissues collaborate to enable the stomach to perform its functions effectively.
Key Points:
- Muscular Tissue: Muscular tissue in the stomach aids in the mechanical digestion of food through contractions. It helps in breaking down food into smaller particles for further processing.
- Epithelial Tissue: Epithelial tissue lines the inner surface of the stomach and plays a crucial role in protecting the stomach from digestive enzymes and acids. It also helps in the absorption of nutrients.
- Glandular Tissue: Glandular tissue in the stomach includes cells that secrete gastric juices containing enzymes and hydrochloric acid. These secretions assist in the chemical breakdown of food.
Question for The StomachTry yourself: What is the function of the stomach in the digestive system?View Solution
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FAQs on The Stomach - Biology for GCSE/IGCSE - Year 11
1. What are the main types of tissues found in the stomach? $#
Ans. The main types of tissues found in the stomach are epithelial tissues, connective tissues, and muscle tissues.
2. How does the stomach function to break down food? $#
Ans. The stomach functions by secreting gastric juices that contain enzymes and acids to help break down food into smaller molecules for easier digestion.
3. What role do the stomach tissues play in the digestive process? $#
Ans. The stomach tissues help facilitate digestion by producing mucus to protect the stomach lining, producing enzymes to break down food, and contracting to mix food with gastric juices.
4. How does the stomach protect itself from the acidic environment it creates? $#
Ans. The stomach protects itself from the acidic environment by producing a layer of mucus that acts as a barrier between the stomach lining and the acidic gastric juices.
5. What happens if there is damage to the stomach tissues? $#
Ans. Damage to the stomach tissues can lead to conditions such as ulcers, gastritis, or even stomach cancer, affecting the digestive process and overall health.
Ans. The main types of tissues found in the stomach are epithelial tissues, connective tissues, and muscle tissues.
2. How does the stomach function to break down food? $#
Ans. The stomach functions by secreting gastric juices that contain enzymes and acids to help break down food into smaller molecules for easier digestion.
3. What role do the stomach tissues play in the digestive process? $#
Ans. The stomach tissues help facilitate digestion by producing mucus to protect the stomach lining, producing enzymes to break down food, and contracting to mix food with gastric juices.
4. How does the stomach protect itself from the acidic environment it creates? $#
Ans. The stomach protects itself from the acidic environment by producing a layer of mucus that acts as a barrier between the stomach lining and the acidic gastric juices.
5. What happens if there is damage to the stomach tissues? $#
Ans. Damage to the stomach tissues can lead to conditions such as ulcers, gastritis, or even stomach cancer, affecting the digestive process and overall health.
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Nov 22, 2024 Last updated |
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