Digestive (alimentary) system

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Digestive (alimentary) system
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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
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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

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Mouth the opening through which an animal or
human takes in food
Ingestion, Digestion
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Salivary Glands

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

Digestion
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Esophagus a muscular passage connecting
the mouth with the stomach
Food moves down the esophagus via peristalsis
muscles contract and relax
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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
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Pancreas a gland, near stomach secretes a
digestive fluid into the intestine through one or
more ducts and also secretes the hormone insulin
Digestion
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• Gall Bladder
• stores Bile a yellow-green liquid made in the
  liver used to break up fats

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

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Duodenumthe first portion of the small
intestine, from the stomach
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Jejunum middle portion of the small intestine
between the duodenum and the ileum
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Ileumthe third and lowest division of the small
intestine

• Assimilation the movement of digested food
  molecules into the cell where they are used

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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
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Colon the part of the large intestine extending
from the cecum to the rectum
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Rectum terminal part of the intestine from the
colon to the anus
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Anus the opening at the lower end of the
alimentary canal, through which the solid refuse
of digestion is excreted
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Egestion

• Passing food through the anus that has not been
  digested
• Called faeces