Digestive System - Science 8

• Energy


  The ability/capability to do "work"
• Mouth

  • 3 parts of the mouth: teeth, saliva, tongue
• Types of teeth

  • Molar (back teeth)
  • Pre-Molar (bicuspids)
  • Incisors (front teeth)
  • Canine (eye teeth)
• Adult humans have 32 teeth
• Child humans have 20 teeth
• Saliva


  Contains enzymes
• Salivary Glands


  Produces saliva
• Tongue


  The most flexible muscle, a group of muscles, the strongest muscle
• Bolus


  The product of chewing food in the mouth
• Digestion


  Breaking down of food into nutrients
• First stage to food processing

  ingestion
• Second stage to food processing

  digestion
• Third stage to food processing

  absorption
• Fourth and final stage to food processing

  elimination
• Liver produces bile
• Swallowing


  Food is pushed back
• Chyme


  Liquified materials
• Absorption


  Taking nutrients and assimilation
• Gall bladder


  Storage of concentration of bile
• Bile


  Breaking down of fats into fatty acids
• Fatty acids have a function of remaining as energy
• Pancreas


  Produces pancreas juices
• Pancreas juices


  Break down sugar and starch
• Small intestine

  • 5x longer than your height
• Parts of the small intestine

  • Duodenum
  • Jejunum
  • Ileum
• Duodenum

  Where the food enters
• Jejunum


  90% absorption of food is here
• Ileum


  Connected to the large intestine
• Teeth - used to break up food into smaller pieces
• Mouth (oral cavity) - where ingestion takes place
• peristalsis - the process
• trancea - a way to the lungs
• mastication - chewing
• salivary glands - produce saliva which contains enzymes that begin digesting carbohydrates, proteins, and fats.
• liquids on the stomach - gastric juices and hydrochloric acids
• Our digestive system can hold 5-10 gallons of urine
• Our digestive system can hold 3-5 gallons of Feces
• Large intestine


  Also known as colon
• Large intestine


  • Separates the liquid from the Feces
• Colon cancer can happen when the large intestine does not function properly everytime