Grade 8 4th quarter science

• Mouth


  where mechanical and chemical digestion starts.
• Chewing


  First step in mechanical digestion
• Bolus


  A soft, moist piece of round mass food.
• Amylase


  enzyme that breaks down into maltose and dextrin.
• Pharynx


  An area at the back of the throat that connects to the nose and mouth.
• Esophagus


  A passage that leads to the stomach.
• Epiglottis


  a small fluid of tissue where food and air are directed to the passage.
• Peristalsis


  A wave of muscular contraction
• Stomach


  a muscular sac,with thick expandable walls.
• Pepsin


  Hydrocholic and acid enzyme.
• Chyme


  a thick liquid made up of partially dugested proteins, starches,acids,undigested sugars, and fats.
• Small intestine


  22 feet 6 inches long
• 3 functions of the small intestine

  >Digests carbohydrates and fats

  >Completes the digestion of proteins

  >Absorbs digested nutrients
• 3 structural psrts of the small intestine

  >Duodenum

  >Jejunum

  >Ileum
• Large Intestine


  Also called as colon
• Large intestine


  absorbs water along with water-soluble vitamins.
• Appendix

  >serves an important role in the fetus and in young adults.
• Bile

  >a fluid that is released by the liver and is stored in the gallbladder.
• Enzymes

  >essential for general health, without these, vitamins and minerals are useless.