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Digestive System. Chapter 38. Parts of the system: Mouth, pharynx, esophagus, stomach, small intestine, Large intestine Accessory organs: Salivary glands, pancreas, liver. Mouth: Teeth tears food into small bits and helps to mix saliva with the food

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Presentation Transcript
slide2
Parts of the system:
  • Mouth, pharynx, esophagus, stomach, small intestine, Large intestine
  • Accessory organs:
  • Salivary glands, pancreas, liver
slide3
Mouth:
  • Teeth tears food into small bits and helps to mix saliva with the food
  • Salvia from the salivary glands contain enzymes to begin the digestive process
  • Tongue will shape the food into a ball called a bolus, it’s now ready for swallowing
slide5
Esophagus: also called the food tube
  • Peristalsis- muscle contractions that move food to the stomach
slide6
Stomach: a sac that mixes food with enzymes and acids. Food is no longer a bolus, now called a chyme. A little bit of digestion
  • Cardiac sphincter- a round muscle found at the top of the stomach. Controls the flow of food into the stomach
slide8
Pyloric sphincter: found at the end of the stomach. Controls the flow of food out of the stomach
slide9
Small Intestines 3 parts
  • Duodenum, jejunum, ileum
  • Most digestion occurs here
slide11
Villi- small fingerlike projections
    • Increase the amount of surface that food passes over
    • Villi contains blood vessels. Nutrients pass via diffusionfrom intestines to blood
  • Travels thru the body and nutrients diffuse out into cells that need the nutrients
slide13
Accessory organs(no food goes thru them, but they aid in digestion)
    • Pancreas: produces sodium bicarbonate to reduce the acid from the stomach. Also produces insulin which regulates blood sugar
    • Liver: makes bile which breaks down fat. Bile is stored in the gall bladder
slide15
Appendix- found on the lower right side. It is where the large and small intestines meet. May have once helped to break down cellulose
slide16
Large Intestines (colon)
  • Parts of: Ascending, transverse, descending, sigmoid, rectum, anus
  • This is where e.coli resides. It feeds on undigested food and releases vit. K
  • Main function is to remove water from the undigested food
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