Table of Contents
- 1 Why is the clitellum of an earthworm so important?
- 2 What is the purpose of excretory openings in earthworms?
- 3 Whats the difference in muscularity between the crop and the gizzard?
- 4 How excretion is perform in earthworm?
- 5 What feature of the intestine increases its surface area and hence an earthworms ability to absorb nutrients?
- 6 What is the function of the aortic arches in an earthworm?
- 7 What are the body parts of an earthworm?
Why is the clitellum of an earthworm so important?
The number of the segments to where the clitellum begins and the number of segments that make up the clitellum are important for identifying earthworms. To form a cocoon for its eggs, the clitellum secretes a viscous fluid. This organ is used in sexual reproduction of some annelids, such as leeches.
What is the point of clitellum?
The clitellum is part of the reproductive system of earthworm. It also secretes a viscous fluid to form a cocoon for it’s eggs. In earthworms the clitellum can only be seen when the worm is sexually mature.
What is the purpose of excretory openings in earthworms?
In earthworm, the nephridia functions for the removal of the excretory wastes both from blood and the coelomic fluid. There are 3 types of nephridia based on the structure and location: Septal nephridia or typical nephridia: Enteronephric nephridia. Integumentary nephridia: Exo-nephric nephridia.
What is the clitellum quizlet?
Clitellum: series of anterior segments enclosed in thick glandular epidermis; encompasses females gonopores and secretes mucus. Hermaphrodites, zygotes develop in a coccon and emerge and juveniles, direct development.
Whats the difference in muscularity between the crop and the gizzard?
The gizzard grinds food. The crop is storage. What do you think is the function of the typhlosole?
What is the excretory structure in earthworm?
nephridia
Earthworms (annelids) have slightly more evolved excretory structures called nephridia, illustrated in Figure 2b. A pair of nephridia is present on each segment of the earthworm. They are similar to flame cells in that they have a tubule with cilia. Excretion occurs through a pore called the nephridiopore.
How excretion is perform in earthworm?
Excretion in earthworm is performed by long, thin and coiled tubules known as nephridia. The nephridia are richly supplied with blood vessels and the glandular cells which extract water and nitrogenous waste like urea, ammonia, amino acid etc. from blood.
What is the function of the mouth in an earthworm?
They do not have teeth. A liplike extension over the mouth helps direct food into the mouth, where the muscular pharynx (throat) grabs it, coats it with saliva and pushes it down the esophagus into the crop, where it is stored before moving on to the gizzard.
What feature of the intestine increases its surface area and hence an earthworms ability to absorb nutrients?
The villi and microvilli are folds on the surface of the small intestine. These folds increase the surface area of the intestine and provide more area for the absorption of nutrients.
What is the function of earthworms?
The earthworm’s crop is responsible for storing food after it has passed through the esophagus, which possesses calciferous glands that release calcium carbonate to help remove any excess quantities of calcium from the body.
What is the function of the aortic arches in an earthworm?
The aortic arches in an earthworm function like the valves in a human heart. An earthworm has five pairs of aortic arches that pump blood into the dorsal and ventricle blood vessels throughout the worm’s body.
What is the reproductive system of an earthworm?
Reproductive System. An earthworms needs to mate with another worm to produce eggs, but they don’t have to look for a specific gender. Most earthworms are hermaphrodites, which means they carry both male and female reproductive organs. To mate, the earthworms basically exchange sperm. Then, each earthworm lays eggs fertilized by the other’s sperm.
What are the body parts of an earthworm?
Earthworms are classified in the phylum Annelida or Annelids. Annelida in Latin means, “little rings.” The body of the earthworm is segmented which looks like many little rings joined or fused together. The earthworm is made of about 100-150 segments. The segmented body parts provide important structural functions.