Science 8th grade | UNIT 2: Food and digestion 2.4 The human digestive system

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Last update: 2022-09-07

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Crash report

Science 8th grade

UNIT 2: Food and digestion 2.4 The human digestive system

Science 8th grade

UNIT 2: Food and digestion 2.4 The human digestive system

2022-09-07

Crash report

Science 8

UNIT 1: Plants

UNIT 2: Food and digestion

UNIT 3: The circulatory system

UNIT 4: Respiration

UNIT 5: Reproduction and development

UNIT 6: Stated of matter

UNIT 7: Elements and compounds

UNIT 8: Mixtures

UNIT 9: Material changes

UNIT 10: Measuring motion

UNIT 11: Sound

UNIT 12: Light

UNIT 13: Magnetism

References

The diagram shows the human digestive system. The digestive system is made up of the alimentary canal, plus the salivary glands, liver and pancreas.

mouth salivary glands oesophagus liver stomach gall bladder pancreas large intestine small intestine appendix anus — ?An X-ray image of part of the alimentary canal. Can you work out which parts are shown

1) After it has been swallowed, food moves along through the space inside the alimentary canal. Write down, in order, the name of each part of the alimentary canal that food passes through as it travels from the mouth to the anus.

2) Name three organs, shown in the diagram, that food does not pass through.

Functions of organs in the digestive system

Stomach Hydrochloric acid kills micro-organisms in the food. Stomach juices begin to break down protein to amino acids Liver The liver makes bile. The bile is stored in the gall bladder. Bile flows into the small intestine, where it helps with fat digestion	Oesophagus Food just passes through here without changing Large intestine All the food that could not be digested and absorbed passes through here. A little more of the water in it is absorbed. The undigested food collects up and forms faeces	Mouth Teeth chew food into smaller pieces. Saliva starts to break down starch to sugar Small intestine Juices from the pancreas finish breaking down starch, protein and fat to small molecules. These small molecules are then absorbed through the walls of the small intestine. Water, vitamins and minerals which are already made of very small particles) are also absorbed
Pancreas The pancreas makes pancreatic juice. Pancreatic juice flows into the small intestine, where it helps to digest protein, starch and fat

Summary

• The alimentary canal is a long tube that runs from the mouth to the anus.
• Inside the alimentary canal, nutrients are first digested and then absorbed.
• Digestion happens inside the mouth, stomach and small intestine. Absorption happens inside the small intestine and large intestine.

Questions

Functions of organs in the digestive system