digestive system

• What is the primary function of the digestive system?

  To absorb nutrients and produce faeces
• How is the digestive system adapted for efficient absorption?

  It has specialized structures for nutrient uptake
• How might the digestive needs of an athlete differ from those of an office worker?

  Athletes require more energy-dense nutrients
• What is produced in the mouth during digestion?

  Digestive juice
• What are enzymes?

  Biological catalysts that speed up digestion
• What is the lock and key model in relation to enzymes?

  It describes how enzymes bind to nutrients
• What do carbohydrases break down?

  Carbohydrates into simple sugars
• What do proteases break down?

  Proteins into amino acids
• What do lipases break down?

  Lipids into fatty acids and glycerol
• What constitutes a balanced diet?

  • Right amount of nutrients
  • Supports body function
  • Prevents deficiencies
• What happens if you do not eat enough of a nutrient?

  You may develop a deficiency
• What are the roles of different nutrients in the body?

  • Carbohydrates: main source of energy
  • Lipids: provide energy
  • Proteins: growth and repair
  • Vitamins and minerals: essential for health
  • Water: needed in all cells
  • Fibre: provides bulk for gut movement
• What is the main source of energy in the body?

  Carbohydrates
• What do lipids provide for the body?

  Energy
• What is the role of proteins in the body?

  Growth and repair of cells
• Why are vitamins and minerals important?

  They are essential in small amounts
• What is the role of water in the body?

  Needed in all cells and fluids
• What does fibre do for the digestive system?

  Provides bulk to keep food moving