the digestive system

• What is meant by a tissue?

  A group of cells with similar structure
• What is an organ?

  A group of tissues working together
• What is an organ system?

  A group of organs working together
• What are the main organs in the digestive system?

  Mouth, esophagus, stomach, small intestine
• What is the function of muscle cells?

  To contract and shorten for movement
• Why do muscle cells contain many mitochondria?

  To provide energy for contraction
• What is the definition of a tissue?

  A group of cells with similar structure and function
• What is the role of glandular tissue in the stomach?

  To release enzymes for digestion
• What is the function of hydrochloric acid in the stomach?

  To help enzymes digest proteins
• What happens to food in the stomach?

  It is churned into a fluid for digestion
• What does bile do in the digestive system?

  Speeds up digestion of lipids and neutralizes acid
• How are small food molecules absorbed in the small intestine?

  By diffusion or active transport
• What is the role of the large intestine?

  To absorb water into the bloodstream
• What happens to the products of digestion?

  They are used to build new carbohydrates, lipids, and proteins
• What is one use of glucose produced during digestion?

  It is used in respiration
• What are the main nutrients found in food?

  • Carbohydrates (e.g., starch)
  • Proteins
  • Lipids (fats)
• What is the process of digestion?

  1. Large food molecules are broken down by enzymes.
  2. Small molecules are absorbed into the bloodstream.
• What is the sequence of food processing in the digestive system?

  1. Chewing in the mouth
  2. Digestion in the stomach
  3. Digestion in the small intestine
  4. Absorption in the bloodstream
  5. Water absorption in the large intestine
  6. Feces release
• What are the functions of the main organs in the digestive system?

  • Mouth: Chews food and begins starch digestion
  • Stomach: Digests proteins and churns food
  • Small intestine: Digests proteins, lipids, and absorbs nutrients
  • Large intestine: Absorbs water and forms feces
• What is the role of enzymes in digestion?

  • Break down large food molecules into smaller ones
  • Facilitate absorption into the bloodstream
• What is the importance of the digestive system?

  • Converts food into energy
  • Provides nutrients for body functions