What is prostomium and its function?
Description. The prostomium is part of the head and holds at least part of the brain and often bears sensory structures such as the eyes, antennae and palps. It may function like a kind of overlip when the animal is feeding.
What is the function of prostomium in annelids?
Function. Prostomium: The prostomium helps to push the body of annelids into the soil. Peristomium: The peristomium surrounds the opening of the mouth.
Why do earthworms have bristles?
Bristles, called setae, are located on each segment of the earthworm’s body. They prevent the earthworm from slipping backwards. FEEDING The earthworm is specially adapted for feeding underground.
What is the function of the worms gizzard?
Earthworms do not have teeth, so they use the strong muscles of the gizzard (and grains of sand and soil) to grind up their food.
Is prostomium sensory in function?
Prostomium is a small lip or tongue like lobe present on the upper side of mouth. It helps the earthworm to push into the soil and is sensory in function. Hence, prostomium serves sensory function.
What is the difference between prostomium and Peristomium?
– The prostomium is the head part which is fleshy and segmented and the periosteum is the first segment of the body of annelid. – The difference between the prostomium and peristomium is that, the prostomium is the front of the mouth found in annelid while peristomium is the surrounding of the mouth opening.
Why is prostomium sensory?
Prostomium is a small lip or tongue like lobe present on the upper side of mouth. The dorsal surface of prostomium contains photoreceptor cells which help them to detect the intensity and duration of light. Hence, prostomium serves sensory function.
What is the difference between Peristomium and prostomium?
How does the setae help the earthworm move?
An earthworm moves using circular and longitudinal muscles, as well as bristles called setae. The earthworm can push the setae out of its body to grab the soil around it. To move forward, the worm uses its setae to anchor the front of its body and contracts the longitudinal muscles to shorten its body.
What is the function of the crop and gizzard in an earthworm?
crop Food passes from the esophagus to the crop, which is a temporary food storage area. In the crop the food gets mixed together. This mixture then moves into the gizzard. gizzard Earthworms do not have teeth to grind their food, but the muscles of their gizzard churns and mixes the food.
What are the body parts of a worm?
A worms body is made up of many segments called ‘annuli’. The length of a worms body has muscles which contract and relax which enables the worm to move along a surface. The ‘annuli’ are covered in tiny hairs called ‘setae’ which help the worms movement.
What is the circulatory system of an earthworm?
The circulatory system of earthworm is closed type that is made up of blood vessels and capillaries that are fork out all over the body. The plasma and corpuscles make up the blood and it has multiple hearts.
What are the parts of an earthworm?
Internal anatomy of an earthworm (lateral section): small, long, cylindrical animal without legs or hard body parts. Mouth cavity: entrance to the digestive tract of an earthworm. Pharynx: part of the digestive tract of an earthworm just after its mouth. Ventral nerve cord: set of nerves in the abdomen of an earthworm.
What is an earthworm segment?
An earthworm is a tube-shaped, segmented worm found in the phylum Annelida . They have a world-wide distribution and are commonly found living in soil, feeding on live and dead organic matter. An earthworm’s digestive system runs through the length of its body. It conducts respiration through its skin.