the digestive system

• What is meant by a tissue?


  A tissue is a group of cells with a similar structure and function.
• What is an organ?

  An organ is a group of tissues working together for a specific function.
• What is an organ system?

  An organ system is a group of organs that work together to form organisms.
• What are the main organs in the digestive system?


  The main organs in the digestive system include the mouth, esophagus, stomach, small intestine, and large intestine.
• What are the three main nutrients found in food?

  The three main nutrients are carbohydrates, proteins, and lipids (fats).
• Why must large food molecules be digested?

  Large food molecules must be digested because they are too large to be absorbed into the bloodstream.
• What role do enzymes play in digestion?

  Enzymes break down large food molecules into smaller molecules during digestion.
• What happens to food in the mouth during digestion?

  Food is chewed, and enzymes in saliva begin to digest starch into smaller sugar molecules.
• What is the function of hydrochloric acid in the stomach?

  Hydrochloric acid helps enzymes to digest proteins in the stomach.
• How does the stomach aid in digestion?

  The stomach churns food into a fluid, increasing the surface area for enzymes to digest.
• What chemicals are released into the small intestine from the liver and pancreas?

  The pancreas releases enzymes, and the liver releases bile into the small intestine.
• What is the role of bile in digestion?

  Bile speeds up the digestion of lipids and neutralizes the acid from the stomach.
• How are small food molecules absorbed in the small intestine?

  Small food molecules are absorbed into the bloodstream by diffusion or active transport.
• What happens in the large intestine during digestion?

  Water is absorbed into the bloodstream in the large intestine.
• What happens to the products of digestion in the body?

  The products of digestion are used by the body to build new carbohydrates, lipids, and proteins.
• How is glucose used in the body?

  Some of the glucose produced is used in respiration.
• What are the main functions of the different organs in the digestive system?

  • Mouth: Chews food and begins starch digestion.
  • Esophagus: Transports food to the stomach.
  • Stomach: Digests proteins and churns food into fluid.
  • Small Intestine: Continues digestion and absorbs nutrients.
  • Large Intestine: Absorbs water and forms feces.