digestive system

• Digestive system


  The system of organs responsible for breaking down food into smaller pieces that can be absorbed into the bloodstream
• Parts of the digestive system

  • Mouth
  • Esophagus
  • Stomach
  • Small intestine
  • Large intestine
• Digestion

  Breaking down and dissolving food so it can be taken into the blood to be used by the body
• Digestion

  • Starts in the mouth
  • Teeth cut and grind food
  • Saliva moistens food and changes starch to sugar
  • Food is pushed down the esophagus by peristalsis
  • Food is broken down into smaller pieces in the stomach
  • Gastric juices act on food to split proteins and fats
  • Food is finally digested and absorbed in the small intestine
  • Undigested food goes to the large intestine
  • Large intestine stores water and waste (feces)
  • Feces are eliminated through the anus
• The process of breaking down and dissolving the food so that it can be taken into the blood to be used by the body is called digestion
• Digestion


  The process by which food is changed into simpler substances that can be used by the body cells to provide energy
• Digestive system

  • Composed of organs working together to get nutrients from the food we eat
  • Has three main functions: break down food into smaller portions, absorb nutrients into bloodstream, and aid in elimination of undigested food
• Digestion

  1. Food passes through the alimentary canal (oral cavity, pharynx, esophagus, stomach, small intestines, large intestines, anus)

  2. Accessory organs (teeth, tongue, salivary glands, liver, gallbladder, pancreas) help digest food
• Mechanical digestion


  Food is broken down into smaller particles, usually in the mouth through chewing and the action of teeth and tongue
• Chemical digestion

  Food particles are broken down into nutrients and other substances that can be absorbed by the body, starting in the mouth and continuing in the stomach and small intestine
• Digestion in the esophagus

  Chewed food (bolus) passes through the pharynx and is pushed down the esophagus by peristalsis
• Digestion in the stomach

  1. Stomach stores and churns the food, mixing it with gastric juices containing mucus, enzymes, water, and hydrochloric acid

  2. Food is broken down into a thick liquid called chyme
• Digestion in the small intestine

  1. Chyme enters the small intestine where most digestion and absorption of nutrients occurs

  2. Substances from the pancreas, liver, and gallbladder are added to further break down the food
• Absorption of nutrients

  Nutrients move through the thin lining of the small intestine and into the bloodstream to be carried to different parts of the body
• Digestion in the large intestine


  Undigested food particles enter the large intestine where water is absorbed, and the remaining waste is stored as feces before being eliminated through the rectum and anus
• Good eating habits for proper digestive system care

  • Eat food rich in fiber
  • Avoid eating too much spicy and fatty food
  • Eat less sweets in between meals
  • Avoid buying uncovered ready-to-eat foods
  • Eat slowly and chew food well
  • Avoid swallowing big chunks of food
  • Avoid eating too much at a time
  • Drink plenty of fluids every day
• Digestion

  1. Chewing

  2. Swallowing

  3. Food travels through esophagus

  4. Food enters stomach

  5. Stomach releases acids and enzymes

  6. Food enters small intestine

  7. Small intestine absorbs nutrients

  8. Unabsorbed food enters large intestine

  9. Large intestine absorbs water and sends waste out of body
• Digestion

  Process of breaking down large insoluble food particles into smaller water soluble molecules that can be absorbed by blood and provide energy
• Stomach kills a lot of bacteria so we don't fall sick
• Liver secretes bile which helps break down fats
• Pancreas releases enzymes to help digest all kinds of food particles
• Small intestine absorbs the broken down food particles and transfers them to the body through blood
• Large intestine absorbs water and other particles and sends the waste material out of the body
• When your face becomes red due to blushing, the lining of your stomach becomes red too
• mouth, pharynx (throat), esophagus, stomach, small intestine, large intestine, rectum, and anus