biology grade 8 rosal science 4th quarter

• Digestive system


  Main function is to digest food and absorb nutrients into the bloodstream
• Large intestine


  Another term is colon
• Absorption


  Movement of molecules from the gastrointestinal tract to the circulatory system
• Digestive system processes food


  1. Usable materials sent to body's cells

  2. Unusable materials go into the large intestine to await dispersal
• Digestion


  Most occurs in the small intestine
• Absorption


  Process of moving nutrients through the villi and into the bloodstream
• Order of digestive processes


  1. Ingestion

  2. Digestion

  3. Absorption

  4. Assimilation

  5. Excretion
• Causes of heartburn


  • Overweight
  • Eating high fat food
  • Lying down soon after eating large meal
• Anemia


  Disease caused by iron deficiency
• Constipation


  Digestive system disorder with less than three bowel movements a week, firm and hard to pass stools
• Stress


  Can cause digestive problems
• Avoiding negative effects of stress


  Eat small but more frequent meals
• Cell cycle


  1. Interphase

  2. G1

  3. S

  4. G2

  5. Mitosis
• Most of a cell's life is spent in the growth and development periods of the cell cycle
• What happens during interphase


  1. DNA replication

  2. Synthesizing enzymes and structures for mitotic activity

  3. Doubling the size and number of enzymes and organelles
• Order of digestive process


  • Mouth
  • Esophagus
  • Stomach
  • Small intestine
  • Large intestine
• Things that can harm the intestinal lining


  • Aspirin
  • Antibiotics
  • Caffeine