What is the excretory system of phylum Platyhelminthes?
Note: Platyhelminthes are the simplest animals having a dedicated excretory system. The flame cells function as a kidney for removing waste materials. The bundles of flame cells are called protonephridia. The flame cells regulate the osmotic pressure and help in maintaining the ionic balance of the organism.
What type of circulatory system do Platyhelminthes have?
Flatworms do not have a circulatory system in the usual sense. There are no veins, lymph nodes, or arteries. Instead, because they are fairly small in size and are so flat, flatworms are able to breathe through their ‘skin,’ which is really just integument, a moist outer covering.
Which organ helps in osmoregulation in Platyhelminthes?
Protonephridia
Complete answer: Protonephridia helps in osmoregulation or ion-regulation. They are also helpful in excretion.
Which type of nervous system is found in flatworms?
Simple bilateral systems The nervous system of a free-living flatworm such as Planaria consists of a brain, longitudinal nerve cords, and peripheral nerve plexuses (interlacing networks of peripheral nerves; from Latin plectere, “to braid”).
What is the name of excretory cells of Platyhelminthes?
A flame cell is a specialized excretory cell found in the simplest freshwater invertebrates, including flatworms, rotifers and nemerteans; these are the simplest animals to have a dedicated excretory system. Flame cells function like a kidney, removing waste materials.
What is protonephridia and Metanephridia?
Definition. Protonephridia refer to the tubular, excretory structures in certain invertebrates, usually ending internally in flame cells and having an external pore, while metanephridia refer to primitive excretory organs present in many invertebrates, originating in a ciliated coelomic funnel.
How do Platyhelminthes respire?
Flatworms do not have a respiratory system. Instead, they have pores that allow oxygen to enter through their body. Oxygen enters the pores by diffusion. There are no blood vessels in the flatworms.
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 carry out excretory osmoregulatory function?
What is the name of the planarian flatworm’s osmoregulatory structure?
Flame Cells of Planaria The cells in the tubules are called flame cells (or protonephridia) because they have a cluster of cilia that looks like a flickering flame when viewed under the microscope. Flame cells function like a kidney, removing waste materials through filtration.
Do flatworms have a central nervous system?
The bilaterally flattened body of flatworms preserves a common organization of the central nervous system (CNS). The CNS of flatworms consists of: (i) the orthogon, composed of main longitudinal nerve cords and transverse commissures that form a ladder-like network.