What is the function of the Clitellum quizlet?
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 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.
Do all earthworms have a Clitellum?
The clitellum is only found on adult worms. Young or juvenile worms do not have a clitellum. The clitellum of each species of earthworm has a distinct colour, size, and shape. Another key structure found on the clitellum is the tubercula pubertatis.
Why the blood of earthworm is red Colour?
Haemoglobin is the most common oxygen-carrying molecule, including in worms. Haemoglobin contains iron, which means most worm blood – including that of earthworms and leeches – is red.
What is difference between Prostomium and Peristomium?
– 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. The prostomium involves many sensory organs that help annelids to thrust inside the soil.
What is the meaning of Peristomium?
: peristome especially : the foremost true segment of an annelid worm usually bearing the mouth.
What is Pygidium Prostomium?
The annelid’s body can be divided into three sections; prostomium, trunk, and pygidium. The anterior end of the body is called the prostomium. The pygidium is the posterior portion of the annelid. The growth of the annelid occurs by adding segments to the front of the pygidium.
What is Prostomium in zoology?
The prostomium (From Ancient Greek, meaning “before the mouth”; plural: prostomia; sometimes also called the “acron”) is the cephalized first body segment in an annelid worm’s body at the anterior end. The prostomium together with the peristomium, which includes the mouth and pharynx, make up the annelid head.
What does the Prostomium look like?
The prostomium (sometimes also called the acron) is the first body segment in an annelid worm’s body in the anterior end. It is in front of (but does not include) the mouth, being usually a small shelf- or lip-like extension over the dorsal side of the mouth.
What is the Typhlosole in an earthworm?
In earthworms, it is a dorsal flap of the intestine that runs along most of its length, effectively forming a tube within a tube, and increasing the absorption area by that of its inner surface. Its function is to increase intestine surface area for more efficient absorption of digested nutrients.
What are the advantages of Typhlosole?
In earthworms, typhlosole is a dorsal flap of the intestine that runs along most of its length, effectively forming a tube within a tube, and 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.
Is Typhlosole present in cockroach?
– The Malpighian tubules in cockroach are the excretory units. So, the correct answer is ‘typhlosole of earthworm’. Note: – The increased surface area of the intestine aids in more effective diffusion of nutrients that pass through the villi and enter the blood vessels.
How are worms important to the ecosystem?
Worms help to increase the amount of air and water that gets into the soil. They break down organic matter, like leaves and grass into things that plants can use. When they eat, they leave behind castings that are a very valuable type of fertilizer. Earthworms are like free farm help.
How do worms affect humans?
Intestinal worms may increase the risk of certain health issues in the body. Some intestinal worms may make it difficult for the body to absorb protein or cause a loss of blood and iron, which could lead to anemia. Intestinal worms may also affect a person’s ability to pass food through the intestines.
Why are some worms harmful?
The good ones are predatory and prey on other invertebrate pests including parasitic nematodes. Some of the more common parasitic nematodes that we know of include roundworms, hookworms and heartworms. These worms can be seriously harmful to your liver if they grow and multiply for long periods of time.
How long is the biggest worm?
The longest earthworm is Microchaetus rappi of South Africa. In 1967 a giant specimen measuring 6.7 m (21 ft) in length when naturally extended and 20 mm (0.8 in) in diameter was found on a road between Alice and King William’s Town.