What is the function of the clitellum, the only organ visible externally on earthworms? It secretes mucus that is important in reproduction . The worm alternates between extension and pulling the rest of its body after the extension.
What is the function of the clitellum?
Sexually mature oligochaetes have a clitellum, which is a modification of a section of the body wall consisting of a glandular, saddlelike thickening near the gonopores. During copulation, the clitellum secretes a mucus that keeps the worms paired while sperm are being exchanged .
What is the function of the earthworm's clitellum that was observed in the earthworm lab?
The clitellum is a thickened glandular and non segmented section of the body wall near the head of the earthworm that secretes a viscid sac in which the eggs are deposited . The clitellum is part of the reproductive system of earthworm. It also secretes a viscous fluid to form a cocoon for it's eggs.
What is the clitellum quizlet?
clitellum. dividing walls between segments . septa . aid with movement of the worm through the soil .
How can you tell the anterior end from the posterior end of the worm quizlet?
(Earthworm) How can you tell the anterior end from the posterior end? The anterior end of an earthworm is its front end, while the posterior end of an earthworm is its back end . The anterior end has a prostomium, which is a fleshy bump that allows for the worm to intake food.
How many hearts does a worm have?
Heartbeats: Worms don't have just one heart. They have FIVE ! But their hearts and circulatory system aren't as complicated as ours — maybe because their blood doesn't have to go to so many body parts. Moving around: Worms have two kinds of muscles beneath their skin.
What is meant by clitellum?
: a thickened glandular section of the body wall of some annelids that secretes a viscid sac in which the eggs are deposited .
Why do worms have 5 hearts?
An earthworm has five hearts that are segmented and pump blood throughout its body ,” said Orsmond. She said their structure was provided by a “hydrostatic skeleton” coelomic fluid (fluid within the body cavity) held under pressure and surrounded by muscles. “There are over 5 500 named species of earthworms worldwide.
What is Typhlosole and its function?
Typhlosole is a dorsal flap of the intestine that runs along most of its length, effectively forming a tube within a tube, and thereby increasing the absorption area by that of its inner surface. Its function is to increase the intestine surface area for more efficient absorption of digested nutrients .
What is the function of earthworm?
Earthworm activities such as feeding, digestion, excretion, and burrowing , facilitate the formation of various drilosphere in their guts or soils around, through which they alter the biological, chemical and physical processes of the ecosystem. Earthworms act as consumer, decomposer and modulator in ecosystem.
What type of circulatory system does the earthworm have?
The earthworm has a closed circulatory system . An earthworm circulates blood exclusively through vessels. There are three main vessels that supply the blood to organs within the earthworm. These vessels are the aortic arches, dorsal blood vessels, and ventral blood vessels.
What structure secretes a capsule in earthworms?
Clitellate annelids are distinguished from other worms by their characteristic reproductive structure, the clitellum , whose function is to secrete an egg capsule, or cocoon. The clitellum appears as a thickened sleeve or saddle a few segments in length within the anterior third region of the worm.
What system's produces the feces solid waste )? What opening does it exit?
The last part of the large intestine is the rectum, which is where feces (waste material) is stored before leaving the body through the anus. The main job of the large intestine is to remove water and salts (electrolytes) from the undigested material and to form solid waste that can be excreted.
What kind of an organism is an earthworm quizlet?
What kind of an organism is an earthworm? An earthworm is a detritus feeder because it consumes decomposing particles of organic matter.
Do worms display Cephalization?
Though not obvious, cephalization does exist in an earthworm. ... Hence, the earthworm exhibits cephalization .
How can you distinguish the anterior from the posterior end of the earthworm?
Find the anterior (front) end of the earthworm by locating the fleshy bump over its mouth, called the prostomium . The posterior (back) end has a small hole where solid waste is expelled, called the anus. The length of the worm is made up of many tiny segments, each separated by a thin wall called a septum.
