The earthworm’s body is well adapted for life in the soil. Click on the brand to watch images and learn more.
Click the green button to view what’s ~ above the outside of an earthworm.
Transcript
Pharynx
Earthworms press the pharynx the end of their mouths come grasp centregalilee.comanize of essential matter. They pull the food ago into your mouths and also then wet it v saliva.
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Gizzard
Earthworms carry out not have actually teeth, so they usage the strong muscles of the gizzard (and grains of sand and soil) come grind up their food.
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Intestine
Once the food is ground up, it moves into the intestine whereby digestive fluids proceed to malfunction the food so it deserve to be absorbed.
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Aortic arches
Most earthworm types have 5 aortic arches or ‘hearts’ that relocate blood approximately the body. The number of aortic arches varies among species.
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Dorsal and ventral blood vessels
The dorsal blood vessel runs along the length of the top side that the earthworm. The contracts and pumps blood come the aortic arches. The ventral blood ship runs follow me the lower length of the earthworm.
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Cerebral ganglion
The earthworm’s ‘brain’. Earthworms have a simple nervous system. The cerebral ganglion is linked to a ventral nerve cord that runs the size of the body. Each segment is connected to this cord, allowing earthworms come move and also respond come light, touch, chemicals, vibrations and more.
Acknowledgement: Sara l Roggemann, 3 Flowers Photography
Circular muscles
Circular muscle surround each segment. When earthworms squeeze this muscles, they become long and also thin. Circular muscles alternate with longitudinal muscles to help earthworms move.
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Longitudinal muscles
Longitudinal muscles run the length of the earthworm. As soon as these muscles contract, earthworms end up being short and fat. Longitudinal muscles alternate with circular muscle to help earthworms move.