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 an example of an organ?

  The stomach, which contains muscle tissue
• 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 is the role of the pancreas in digestion?

  To release enzymes for starch and protein digestion
• What does bile do in the digestive system?

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

  By diffusion or active transport
• What happens in the large intestine?

  Water is absorbed into the bloodstream
• What is the final product released from the body?

  Feces
• What are the three main nutrients found in food?

  Carbohydrates, proteins, and lipids
• Why must large food molecules be digested?

  They are too large to be absorbed directly
• What is the purpose of digestion?

  To break down large molecules into smaller ones
• How is glucose used in the body?

  It is used in respiration
• What are the main functions of the digestive system organs?

  • Mouth: Chews food and begins starch digestion
  • Esophagus: Transports food to the stomach
  • Stomach: Digests proteins and churns food
  • Small intestine: Digests proteins, starch, and lipids; absorbs nutrients
  • Large intestine: Absorbs water and forms feces
• What is the process of digestion in the digestive system?

  1. Ingestion of food
  2. Mechanical digestion in the mouth
  3. Chemical digestion in the stomach and small intestine
  4. Absorption of nutrients in the small intestine
  5. Water absorption in the large intestine
  6. Excretion of feces
• What are the products of digestion used for in the body?

  • Building new carbohydrates
  • Synthesizing proteins
  • Storing lipids
  • Providing energy through respiration