organisation

• 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 is the main function of muscle cells?

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

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

  A group of cells with similar structure and function
• How does an organ differ from a tissue?

  An organ is made of multiple tissues
• What is an example of an organ?

  The stomach
• What types of tissues are found in the stomach?

  Muscle tissue and glandular tissue
• What is the role of glandular tissue in the stomach?

  To release enzymes for digestion
• What is an example of an organ system?

  The digestive system
• 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
• What should you be able to describe by the end of the video?

  The enzymes in the digestive system
• What role do enzymes play in digestion?

  They break down large molecules into smaller ones
• What is the role of enzymes in digestion?

  They catalyze chemical reactions and speed them up
• Where does food first get chewed?

  In the mouth
• What happens to starch in the mouth?

  It begins to be digested into sugars
• What are enzymes made of?

  Large protein molecules
• What is the active site of an enzyme?

  It is where the substrate attaches
• What is the function of hydrochloric acid in the stomach?

  It helps enzymes digest proteins
• What is the substrate in enzyme reactions?

  The molecule that the enzyme breaks down
• What does the lock and key theory describe?

  Enzymes are specific to their substrates
• What is the role of the pancreas in digestion?

  It releases enzymes for starch and protein digestion
• What type of enzymes break down proteins?

  Proteases
• Where are proteases found in the digestive system?

  In the stomach and pancreatic fluid
• What does bile do in the digestive system?

  It 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 are proteins made of?

  Chains of amino acids
• What is released from the body at the end of digestion?

  Feces
• What happens to proteins during digestion?

  They are converted to individual amino acids
• What are the products of digestion used for in the body?

  To build new carbohydrates, lipids, and proteins
• What type of enzymes break down carbohydrates?

  Carbohydrases
• What is glucose used for in the body?

  It is used in respiration
• What is the specific enzyme that breaks down starch?

  Amylase
• Where can you find more questions on the digestive system?

  In the revision workbook
• Where is amylase found?

  In saliva and pancreatic fluid
• What is the structure of a lipid molecule?

  Glycerol attached to three fatty acids
• What are the main functions of the organs in the digestive system?

  • Mouth: Chews food and begins starch digestion
  • Stomach: Digests proteins and churns food
  • Small intestine: Absorbs nutrients and continues digestion
  • Large intestine: Absorbs water and forms feces