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Digestive (alimentary) system

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Presentation on theme: "Digestive (alimentary) system"— Presentation transcript:

1 Digestive (alimentary) system

2 Alimentary canal: tubular passage for digestion and absorption of food and the elimination of food residue; begins at the mouth and ends at the anus

3 Ingestion Taking substances like food or drink into the body through the mouth. Digestion the break down of large food pieces into small, water soluble molecules

4 Mouth: the opening through which an animal or human takes in food
Ingestion, Digestion

5 Salivary Glands Digestion
Glands that produce saliva, an important part of chemical digestion in the mouth enzyme - amylase Digestion

6 Esophagus: a muscular passage connecting the mouth with the stomach
Food moves down the esophagus via peristalsis – muscles contract and relax

7 Liver: large gland responsible for:
1) the uptake, storage, and disposal of nutrients and toxins 2) the production of proteins and metabolism of substances produced by the body Digestion, Assimilation

8 Pancreas: a gland, near stomach; secretes a digestive fluid into the intestine through one or more ducts and also secretes the hormone insulin Digestion

9 Gall Bladder: Digestion
stores Bile; a yellow-green liquid made in the liver used to break up fats Digestion

10 Stomach: a saclike enlargement of the alimentary canal; forming an organ for storing, diluting, and digesting food Digestion

11 Small intestine: lies between the stomach and colon, consists of duodenum, jejunum, and ileum, secretes digestive enzymes, and is the chief site of the absorption of digested nutrients Absorption Absorption – the movement of digested food molecules through the wall of the intestine into the blood

12 Duodenum:the first portion of the small intestine, from the stomach

13 Jejunum: middle portion of the small intestine; between the duodenum and the ileum

14 Ileum:the third and lowest division of the small intestine
Assimilation – the movement of digested food molecules into the cell where they are used

15 Large intestine: terminal division of the vertebrate intestine that is wider and shorter than the small intestine; divided into cecum, colon, and rectum; reabsorption of water and the formation of feces Some Absorption

16 Colon: the part of the large intestine extending from the cecum to the rectum

17 Rectum: terminal part of the intestine from the colon to the anus

18 Anus: the opening at the lower end of the alimentary canal, through which the solid refuse of digestion is excreted

19 Egestion Passing food through the anus that has not been digested;
Called faeces


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