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The Digestive System

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Comparative Anatomy


Welcome to The Digestive System

The digestive system uses mechanical and chemical methods to break food down into nutritious molecules that can be absorbed into the blood stream.
There are two types of plans and two locations of digestion. There are sac-like plans located in many invertebrates. Invertebrates have only one opening for food intake and the discharge of wastes. Vertebrates use the more efficient tube plan. Food enters through the mouth and wastes leaves the anus.

Intracellular digestion is when food is taken into cells by phagocytosis with digestive enzymes being secreted into the phagocytic vesicles, which occurs in sponges, coelenterates and most protozoans.

Extracellular digestion is when digestion occurs in the lumen , or the opening, of the digestive system, then the nutrient molecules are transferred to the blood, this normally occurs in annelidschordates, chordates, and crustaceans.

Here is a more in detail Picture of the Digestive System.


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