of 43 /43
Aarti Pandey Bed 2010-2011 Roll no.90 Subject: Science Topic: Human Digestive System

Human Digestive System(Science)

Embed Size (px)



Text of Human Digestive System(Science)

  • 1. Aarti Pandey Bed 2010-2011 Roll no.90 Subject: Science Topic: Human Digestive System

2. Definitions and Concepts

  • Organa structure made up of two or more kinds of tissues organized in such a way that they can together perform a more complex function than can any tissue alone
  • Organ systema group of organs arranged in such a way that they can together perform a more complex function than can any organ alone

3. Human Digestive System 4. How is food digested?

  • Digestion involves:
  • Breaking down of food into smaller pieces
  • The mixing of food
  • Movement through the digestive tract
  • Chemical breakdown of the large molecules of food into smaller molecules

5. 6. Organs of Digestion and there Functions

  • Mouth
  • Teeth bite off and chew food into a soft pulp that is easy to swallow.
  • Chewing mixes the food with saliva, from salivary glands around the mouth and face, to make it moist and easy to swallow.

7. Mouth

  • Enzymes in the saliva begin digestion of carbohydrates.


  • Esophagus
  • The esophagus is a
  • muscular
  • tube. It takes food from
  • the throat and pushes
  • it down through the neck,
  • and into the stomach.
  • It moves food by waves
  • of muscle contraction called
  • peristalsis.

9. Stomach

  • The stomach has thick muscles in its wall. These contract to mash the food into a water soup called chyme.
  • The stomach lining produces strong digestive juices.

10. Stomach

  • These create chemical reactions in the stomach, breaking down and dissolving its nutrients.

11. Small Intestine

  • This part of the digestive tract is narrow, but very long - about 20 feet.
  • Enzymes continue
  • the chemical reactions
  • on the food.

12. Small Intestine

  • The nutrients are broken down small enough to pass through the lining of the small intestine, and into the blood (diffusion).
  • Nutrients are carried away to the liver and other body parts to be processed, stored and distributed.

13. Large Intestine

  • Useful substances that were not absorbed in the small intestine, such as spare water and body minerals, are absorbed through the walls of the large intestine, back into the blood
  • The remains are
  • formed into brown,
  • semi-solid feces, ready
  • to be removed from the body

14. Rectum and Anus

  • The end of the large intestine and the next part of the tract, the rectum, store the feces.
  • Feces are finally squeezed through a ring of muscle, the anus, and out of the body.

15. Pancreas

  • The pancreas, like the stomach, makes digestive juices called enzymes which help to digest food further as it enters the small intestines.

16. Gall Bladder

  • A small baglike part under
  • the liver.
  • It stores a fluid called bile,
  • which is made in the liver.
  • As food from a meal enters
  • the small intestine, bile flows
  • from the gall bladder along the bile
  • duct into the intestine.
  • It helps to digest fatty foods and also contains wastes for removal.

17. Liver

  • Blood from the intestines
  • enters to the liver, carrying
  • nutrients, vitamins and
  • minerals, and other products
  • from digestion.
  • The liver is like a food-processing
  • factory with more than 200 different jobs.
  • It stores some nutrients, changes them from one form to another, and releases them into the blood according to the activities and needs of the body.

18. Identify the organs of digestive system 19.

  • Q.1.Name some organ system in the human
  • body
  • Q.2. Name the organs of the digestive
  • system.
  • Q.3. Match the following:

Coil like part Part with bulges on theoutside Bag like part Stomach Small intestine Large intestine shape of digestiveorgansDigestive system 20. Nasal Passage Bronchiole Alveoli Pharynx Trachea Bronchi Human Respiratory System Diagram 21. Oxygen Cell Hi I am O 2,you can callme oxygen, and I will be your guide today.I advise you keep all feetand hands inside the ride at all times. JH 22. Respiratory Intro You may be asking, what is the Respiratory system? Well, the Respiratory system is the system that helps you breath in and out, so oxygen (0 2 ) can be pumped through your body and carbon dioxide (CO 2 ) can be removed from the blood stream. You must remember that the Respiratory system is made up of many different organs.JH 23. Where are we? Here We Go!!! JH Nasal Passage Bronchi Tubes Alveoli (air-sacs) Thin-walled blood vessels called capillaries Very thin cells line the alveoli so that O 2and CO 2can pass in and out of the blood. Bronchioles pass air to and from your alveoli. The Trachea is held open by partial rings of cartilage. Tongue Pharynx 24. Picture Intro Here is a overview picture of theRespiratory System . Just go to the next slide to see it. MB 25. Respiratory OverviewPicture MB Nasal Cavity Nose Mouth Bronchus Bronchiole Alveolus Diaphragm Throat (pharynx) Windpipe (Trachea) Left lungs Ribs 26. Welcome The Respiratory System Now we will begin our tour.Welcome to MB 27. The Nose and Mouth This is where it all begins.This is where theoxygenfirstenters your body and also whereCarbon Dioxideleaves. MB 28. The Nose and Mouth When the air comes into yournoseit gets filtered by tiny hairs and it is moistened by the mucus that is in your nose.Yoursinusesalso help out with yourRespiratory System . They help to moisten and heat the air that you breath. Air can also get into your body through your mouth/oral cavitybut air is not filtered as much when it enters in through yourmouth .MB 29. Nose and Mouth Picture Nasal Cavity Nostril Oral Cavity Pharynx Here is a picture of yournasalandoral cavity . MB 30. The Pharynx and Trachea Next we will head down to yourpharynx (throat)and yourtrachea (windpipe) . This is where the air passes from yournoseto yourbronchi tubesandlungs . MB 31. The Bronchi Tubes and Bronchiole Thesebronchi tubessplit up, liketree branches, and get smaller and smaller inside your lungs. The air flows past yourbronchi tubes and into yourbronchiole . These tubeskeep getting smaller and smaller until they finally end with small air sacs (calledalveoli ). But we will go there laterMB 32. The Pharynx and Trachea Yourpharynx (throat)gathers air after it passesthrough yournoseand then the air is passed down toyourtrachea (windpipe) . Yourtracheais held open by incomplete rings of cartilage. Without these rings yourtracheamight close off and air would not be able to getto and from yourlungs . MB Pharynx (Throat) Mouth Trachea 33. The Bronchi Tubes and BronchioleIntro Yourtrachea (windpipe)splits up intotwobronchi tubes . These two tubes keep splitting up and form yourbronchiole . MB 34. Alveoli and Bronchi Picture Trachea Bronchi Tubes Bronchiole Alveoli MB 35. The Alveoli and Capillary Network Youralveoliare tiny air sacs that fill up with air/oxygen when youbreath in. Youralveoliare surrounded by many tiny blood vessels called capillaries .The walls of youralveoli(andcapillaries ) are so thin that theoxygenorcarbon dioxidecanpass through them, traveling right into, or out of your blood stream. MB 36. Alveoli Picture Here is a close up picture of yourAlveoli and aCapillary surrounding it. MB Capillary Red Blood Cell Oxygen is picked up Carbon Dioxide is dropped off Wall of the air sac 37. Alveolus Bronchiole Respiratory Bronchiole Alveolar Duct Alveolar Sac Capillaries Alveolus JH 38. Intro to Diaphragm Now we will look at theDiaphragm . You might be wondering, what does theDiaphragmdo? TheDiaphragmis an important factor in breathing.JH 39. Diagram of Diaphragm JH 40. Experiment Instructions 1 styou need a bottle that you can sacrifice tocut up.2 ndyou cut the bottom of the bottle and put a big balloon on the bottom. 3 rdget a rubber cork ( make sure it blocks the hole)and put a hole through it ( top to bottom). Insert a thin tube into the cork and place a balloon on the bottom of the tube. 4 thmake sure the thing is airtight. JH 41. Diaphragm Experiment Here is an experiment that you can try. JH 42.

  • Q.1. Which organs help in the function of
  • respiration?
  • Q.2. Find the odd-man-out:
  • diaphragm, pancreas, alveoli, trachea.