What is the excretory system of Platyhelminthes?

What is the excretory system of Platyhelminthes?

Flatworms have an excretory system with a network of tubules throughout the body that open to the environment and nearby flame cells, whose cilia beat to direct waste fluids concentrated in the tubules out of the body. The system is responsible for regulation of dissolved salts and excretion of nitrogenous wastes.

What type of circulatory system do Platyhelminthes have?

Flatworms have no circulatory system. Animals without a circulatory system have limited abilities to deliver oxygen and nutrients to their body cells because of the way that molecules behave.

What are the Osmoregulatory organs of phylum Platyhelminthes?

For excretion and osmoregulation, protonephridia (singular protonephridium) are used. They resemble a network of two or more closed longitudinal branched tubules running the length of the body.

Which type of digestive system is found in Platyhelminthes?

Flatworms have an incomplete digestive system. This means that the digestive tract has only one opening. Digestion takes place in the gastrovascular cavity. Flatworms do not have a respiratory system.

How do Platyhelminthes carry out excretory Osmoregulatory function?

In flatworms, excretion is accomplished by the epithelial lining of the gut, by the body wall, by exocytosis of vesicles, and by protonephridia. Osmoregulation in flatworms has not been demonstrated conclusively, but is thought to take place in the protonephridia.

How do Platyhelminthes respire?

Flatworms have no specialized respiratory system; gases simply diffuse across the body wall.

What is excretory and Osmoregulatory structure in Platyhelminthes?

Excretion and osmoregulation by flatworms is controlled by “flame cells” located in protonephridia (these are absent in some forms). Flatworms lack a respiratory or circulatory system; these functions take place by absorption through the body wall.

What is Osmoregulatory system?

Osmoregulation is the process of maintaining salt and water balance (osmotic balance) across membranes within the body. The fluids inside and surrounding cells are composed of water, electrolytes, and nonelectrolytes.

In which phylum the complete digestive system is observed first?

phylum Aschelminthes
Digestive system is first completed in phylum Aschelminthes.

How do platyhelminthes carry out excretory Osmoregulatory function?

How is the body system of Platyhelminthes?

Flatworms are bilaterally symmetrical with a defined head and tail region and a centralized nervous system containing a brain and nerve cords. They have no circulatory system or body cavity (coelom), but they do have an excretory and digestive system. They take in oxygen through their skin.

How do organisms in phylum Platyhelminthes perform gas exchange?

In simple organisms, such as cnidarians and flatworms, every cell in the body is close to the external environment. Their cells are kept moist so that gases diffuse quickly via direct diffusion. Flatworms are small, literally flat worms, which ‘breathe’ through diffusion across the outer membrane.

What is the osmoregulatory system of platyhelminths?

Describe the osmoregulatory system of platyhelminths. 1) Network of tubules running through mesenchyme, beginning in FLAME CELLS & opening to environment via NEPHRIDIOPORES. 2) Flame cells & their associated network of tubules are called PROTONEPHRIDIUM.

What is a Platyhelminthes?

Phylum Platyhelminthes (Flatworms) Introduction 1. Bilaterally symmetrical, acoelomate, unsegmented, free-living or parasitic worms with a mouth & enteron (absent in some parasitic groups) but no anus. 2. Anterior brain& longitudinal nerve cords; protonephridial excretory system; complex hermaphrodite reproductive system; cephalization.

Should acoels be placed in the phylum Platyhelminthes?

In fact, molecular evidence suggests that acoels should not be placed in phylum Platyhelminthes and that they represent the earliest divergent Bilateria. In body form they are small and have a mouth but no gastrovascular cavity or excretory system.

What is the osmoregulatory system of a flatworm?

Except in the turbellarian order Acoela, the osmoregulatory system of flatworms consists of protonephridia (excretory or osmoregulatory organs closed at the inner end) with flame cells (Figure 14-6). A flame cell is cup shaped with a tuft of flagella extending from the inner face of the cup.