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The Digestive System Life Science 5 8/08
The  digestive system  is a group of organs that process the food we eat and takes out the nutrients our bodies need.
It all begins in the mouth where food is broken into small pieces by the teeth and mixed with  saliva  (spit)  which has chemicals that help with digestion.
[object Object]
The esophagus delivers the food to a storage bag, the  stomach  where it is mixed with other chemicals and digestive juices.
Bile is an important digestive juice that is made in the  liver.
After it leaves the  stomach  the material moves into a long, folded  small intestine  where the nutrients are removed.
The inside of the small intestine is lined with millions of tiny, finger-like projections called  villi  ( vil  eye). Villi  absorb nutrients from our food. Villi is the plural for villus. 1 villus  2 villi
[object Object],The large intestine is shorter but bigger around than the small intestine. Stomach Small intestine  Large intestine
[object Object],After that the solid waste goes into the toilet.
Let’s review: After it leaves the mouth the order of the organs that food passes through is
Let’s review: After it leaves the mouth the order of the organs that food passes through is 1.  Esophagus
Let’s review: After it leaves the mouth the order of the organs that food passes through is 1.  Esophagus 2.  Stomach
Let’s review: After it leaves the mouth the order of the organs that food passes through is 1.  Esophagus 2.  Stomach 3.  Small intestine
Let’s review: After it leaves the mouth the order of the organs that food passes through is 1.  Esophagus 2.  Stomach 3.  Small intestine 4.  Large intestine
 
1
1 2
1 2 3
1 2 3 4
 
Excretory system
The excretory system removes cellular waste  from the blood.
The excretory system removes cellular waste  from the blood. ,[object Object]
The main organs in the excretory system are the  kidneys.
Every living animal cell creates waste called urea as it uses energy.  This waste is carried away in the blood.
Blood flows through the kidneys where urea is removed.
Urea is removed through tiny tubes in the kidneys called  nephrons.
Urea and other waste products are sent from the kidneys as urine (a yellow liquid)  in tubes called  jjjjjjjjjjjj ureters ,  or  urine tubes .
The ureters take urine to a bag-like muscle called the  bladder  where it is stored until we go to the bathroom.
The excretory system
[object Object],What is the tube that carries food from the mouth to the stomach ?
[object Object],What is the tube that carries food from the mouth to the stomach ? The esophagus
[object Object],What is the tube that carries food from the mouth to the stomach ? The esophagus
[object Object],Where does food go after it leaves the stomach ?
[object Object],Where does food go after it leaves the stomach ? Small intestine
[object Object],Where does food go after it leaves the stomach ? Small intestine
[object Object],Where is most water removed from food material before it leaves the body ?
[object Object],Where is most water removed from food material before it leaves the body ? Large intestine  also called the   colon
[object Object],Where is most water removed from food material before it leaves the body ? Large intestine  also called the   colon
[object Object],Where are nutrients removed from food ?
[object Object],Where are nutrients removed from food ? Small intestine
[object Object],Where are nutrients removed from food ? Small intestine The villi
[object Object],What are two examples of  digestive juices ?
[object Object],What are two examples of  digestive juices ? Saliva   from the mouth
[object Object],What are two examples of  digestive juices ? Saliva   from the mouth
[object Object],What are two examples of  digestive juices ? Saliva   from the mouth Bile   from the liver
[object Object],What are two examples of  digestive juices ? Saliva   from the mouth Bile   from the liver
[object Object],What are the most important organs in the excretory system?
[object Object],What are the most important organs in the excretory system? The kidneys
[object Object],What are the most important organs in the excretory system? The kidneys
[object Object],What do the kidneys do?
[object Object],What do the kidneys do? They remove  cellular waste  (urea)   from the blood.
[object Object],What do the kidneys do? They remove  cellular waste  (urea)   from the blood.
[object Object],What happens to the waste after the kidneys remove it from the blood?
[object Object],What happens to the waste after the kidneys remove it from the blood? It goes as urine to the bladder.
[object Object],What happens to the waste after the kidneys remove it from the blood? It goes as urine to the bladder.
 

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Digestive and excretory systems

  • 1. The Digestive System Life Science 5 8/08
  • 2. The digestive system is a group of organs that process the food we eat and takes out the nutrients our bodies need.
  • 3. It all begins in the mouth where food is broken into small pieces by the teeth and mixed with saliva (spit) which has chemicals that help with digestion.
  • 4.
  • 5. The esophagus delivers the food to a storage bag, the stomach where it is mixed with other chemicals and digestive juices.
  • 6. Bile is an important digestive juice that is made in the liver.
  • 7. After it leaves the stomach the material moves into a long, folded small intestine where the nutrients are removed.
  • 8. The inside of the small intestine is lined with millions of tiny, finger-like projections called villi ( vil eye). Villi absorb nutrients from our food. Villi is the plural for villus. 1 villus 2 villi
  • 9.
  • 10.
  • 11. Let’s review: After it leaves the mouth the order of the organs that food passes through is
  • 12. Let’s review: After it leaves the mouth the order of the organs that food passes through is 1. Esophagus
  • 13. Let’s review: After it leaves the mouth the order of the organs that food passes through is 1. Esophagus 2. Stomach
  • 14. Let’s review: After it leaves the mouth the order of the organs that food passes through is 1. Esophagus 2. Stomach 3. Small intestine
  • 15. Let’s review: After it leaves the mouth the order of the organs that food passes through is 1. Esophagus 2. Stomach 3. Small intestine 4. Large intestine
  • 16.  
  • 17. 1
  • 18. 1 2
  • 19. 1 2 3
  • 20. 1 2 3 4
  • 21.  
  • 23. The excretory system removes cellular waste from the blood.
  • 24.
  • 25. The main organs in the excretory system are the kidneys.
  • 26. Every living animal cell creates waste called urea as it uses energy. This waste is carried away in the blood.
  • 27. Blood flows through the kidneys where urea is removed.
  • 28. Urea is removed through tiny tubes in the kidneys called nephrons.
  • 29. Urea and other waste products are sent from the kidneys as urine (a yellow liquid) in tubes called jjjjjjjjjjjj ureters , or urine tubes .
  • 30. The ureters take urine to a bag-like muscle called the bladder where it is stored until we go to the bathroom.
  • 32.
  • 33.
  • 34.
  • 35.
  • 36.
  • 37.
  • 38.
  • 39.
  • 40.
  • 41.
  • 42.
  • 43.
  • 44.
  • 45.
  • 46.
  • 47.
  • 48.
  • 49.
  • 50.
  • 51.
  • 52.
  • 53.
  • 54.
  • 55.
  • 56.
  • 57.
  • 58.