Life Science: Pre-lab homework directions: Watch the video on how to open up your earthworm. Answer the questions that follow and study over the anatomy of the earthworm diagram.
When the earthworm swallows its food and dirt it moves from the mouth to the pharynx into the esophagus down into the crop and is ground up in the tough muscular gizzard. This organ will feel like a hard tennis ball. Next food moves down into the intestines and is digested and then excreted out the anus. Worms aerate the soil and make the soil nutritious with their "castings". The recycling of organic matter in the dirt is important for the plants and worms are very useful in this sense.
Notice that in the chart the hearts are like arches, they have five aortic arches we will look for tomorrow in lab. Note the large seminal vesicles and receptacle, these are reproductive organs. Is there a large brain in the earthworm? What body system is extremely developed in the earthworm and why?
Click on the blue link below:
How to dissect an earthworm...
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