How the earthworm's body works
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Because they burrow the earthworm as no use for sensory organs such as eyes or food-catching structures. Their digestive system may be the most interesting thing about them- there are a number of regions that the worm as in the system with special functions.
Firstly, Food that enters the mouth is swallowed by the action of the muscular pharynx. It then passes through a narrow oesophagus that has three swellings on each side. These are the calciferous glands that excrete calcium carbonate to dispose of excess calcium obtained in the food.
The food then moves to the crop, which seems to serve only as a storage organ, and then to the muscular gizzard. With the aid of very tiny stones swallowed by the worm, the gizzard grinds the food thoroughly.
Food is then digested by juices secreted by gland cells in the intestine. It is absorbed by blood vessels in the intestinal wall and from there distributed to the rest of the body. How complex is that for such a small creature!
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