human digestive sytem

HUMAN DIGESTIVE SYSTEMCHAPTER 14 (UNIT 1)

M.A ZINDELA

WHAT IS DIGESTION

• Digestion is the mechanical and chemical breaking down of food into smaller components, to a form that can be absorbed, for instance, into a blood stream.

• Digestive system is a group of organs working together to convert food into energy and basic nutrients to feed the entire body

• Human digestive system is a complex series of organs and glands that processes food. In order to use the food we eat, our body has to break the food down into smaller molecules that it can process; it also has to excrete waste.

THE ACCESSORY DIGESTIVE ORGANS

• Salivary glands

• Teeth

• Pancreas

• Liver

• Gall blader

WHAT IS CHEMICAL AND MECHANICAL DIGESTION

• Our Mouth: Believe it or not, the mouth will prepare for digestion before food even enters. Just the smell, sight, or sound of food is enough to trigger saliva glands into action. This is important because the chemicals in saliva work with the mechanism of the tongue and teeth to break down food in a way that both prepares it for the next steps and ensure optimal absorption of nutrients.

THE PARTS THAT FORM DIGESTION SYSTEM

• Esophagus

• Stomach

• Liver

• Gallbladder

• Pancreas

• Duodenum

• Descending colon

• Ascending colon

• Small intestine

• Appendix

• Rectum

• anus

PARTS OF DIGESTIVE SYSTEM

THE END PART OF DIGESTION

THE END PART OF DIGESTIVE SYSTEM

REFERENCES

• http://www.slideshare.net/SECBIO/digestion-29026783?utm_source=slideshow02&utm_medium=ssemail&utm_campaign=share_slideshow

• http://www.slideshare.net/guest74134f/presentation-06-human-digestion

• http://www.slideshare.net/guest970cb3/ch-14-b-accessory-organs