Digestive system
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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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Digestive System

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Digestive system

Digestive System

Chapter 38


Digestive system

  • Parts of the system:

  • Mouth, pharynx, esophagus, stomach, small intestine, Large intestine

  • Accessory organs:

  • Salivary glands, pancreas, liver


Digestive system

  • 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


Digestive system

  • Esophagus: also called the food tube

  • Peristalsis- muscle contractions that move food to the stomach


Digestive system

  • 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


Digestive system

  • Pyloric sphincter: found at the end of the stomach. Controls the flow of food out of the stomach


Digestive system

  • Small Intestines 3 parts

  • Duodenum, jejunum, ileum

  • Most digestion occurs here


Digestive system

  • 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


Digestive system

  • 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


Digestive system

  • Appendix- found on the lower right side. It is where the large and small intestines meet. May have once helped to break down cellulose


Digestive system

  • 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


Digestive system

  • End of notes for the year


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