What is the external anatomy of an earthworm. The alimentary canal is a long tube running from first to the last segment.
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The first segment of the earthworm the peristomium see figure 1 contains the mouth.
Anatomy of earthworm. Start a free trial of quizlet plus by thanksgiving lock in 50 off all year try it free ends in 02d 20h 00m 51s. The front or head of the worm is called the anterior. The external body of an earthworm is well adapted for living in the soil similar to the external structure of other insects.
Internal anatomy of earthworm. Morphology of earthworm anatomy. The very first section of the anterior contains the mouth and prostomium.
Extends o produces stores and releases sperm. The earthworm is made of about 100 150 segments. Find the anterior front end of the earthworm by locating the fleshy bump over its mouth.
The body wall is the outer tube and the alimentary canal is the inner tube. The two tubes are separated by an extensive space the body cavity or coelom. Earthworms are classified in the phylum annelida or annelids.
Earthworms use the prostomium to see their environment as earthworms have no eyes ears nose or hands. They occur worldwide and are commonly found in soil eating live and dead organic matter. Earthworm anatomy learn with flashcards games and more for free.
About one third of the way back from the mouth you should see a thicker and smoother section. Notice that the earthworm has a rounded dorsal back. A muscular opening at the end of the rectum through which wast where digestion begins organs that remove metabolic wastes from an animals body a connects the mouth to the esophagus.
An earthworms digestive system runs the length of its body. It respirates through its skin. Anatomy of an earthworm.
Earthworms have a closed circulatory system constituting a heart. It is to be noted that the body of the earthworm is essentially a double tube. There is a small tongue like lobe just above the mouth called the prostomium see figure 1.
Annelida in latin means little rings the body of the earthworm is segmented which looks like many little rings joined or fused together. An earthworm is a tubular segmented worm of the phylum annelida. Externally a thin non cellular cuticle covers the body wall of the earthworm.
Stores food until it can be ground up by the gizzard.
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