What is a canal system?

Definition of canal system

: a system of passages connecting various cavities of the animal body (as in corals and sponges)

What are the features of a canal?

Features. At their simplest, canals consist of a trench filled with water. Depending on the stratum the canal passes through, it may be necessary to line the cut with some form of watertight material such as clay or concrete. When this is done with clay, it is known as puddling.

How many canal systems are there?

Three main types of canal systems in the order of increasing complexity are asconoid, syconoid and leuconoid (2). over by choanocytes. ➢ The route followed by the water currents is ostia, spongocoel and osculum.

What is a canal in geography?

A canal is a human-made waterway that allows boats and ships to pass from one body of water to another. … Waterways are the navigable parts of a body of water, and can be located within a bay or open sea, can connect two or more waterbodies, or may even form networks within a city.

What is canal called in English?

an artificial waterway for navigation, irrigation, etc. a long narrow arm of the sea penetrating far inland. a tubular passage or cavity for food, air, etc., especially in an animal or plant; a duct. channel; watercourse.

What are the 3 types of canal system in sponges?

There are usually three types of canal system met within sponges, viz., asconoid type, syconoid type and leuconoid type.

Which of the following have canal system?

The body of a porifera or sponge is organised in such a manner as to form a complex system of pores and canals. This system is called canal system.

Which is the simplest canal system?

A) Asconoid canal system: This is the simplest form of canal system present in Leucosolenia – like asconoid sponges. This is the only canal structure in which choanocytes are coated with spongocoel. Cells called podocytes are expressed by the ostia. Within them, these cells have an intracellular canal.

What are the 4 main types of cells found in sponges?

Although sponges do not have organized tissue, they depend on specialized cells, such as choanocytes, porocytes, amoebocytes, and pinacocytes, for specialized functions within their bodies.

What are the 4 main types of cells found in sponges briefly describe each?

Cell types
  • epidermal cells – form outer covering.
  • amoeboid cells – wander about, make spicules and skeleton, capture food.
  • collar cells (choanocytes) – create water currents, capture food.
  • pore cells – surround incurrent pores.

What is canal system in zoology?

Canal system is also known as aquiferous system. The canal system of sponges helps in food acquisition, respiratory gas exchange and also in excretion. The numerous perforations on the body surface of the sponges for ingression and egression of water current are the main constituents of the canal system.

Where is the Ostia in a sponge?

In other sponges, ostia are formed by folds in the body wall of the sponge. Between the outer layer and the feeding chambers of the sponge is a jelly-like substance called the mesohyl, which contains collagenous fibers.

Are Choanocytes totipotent?

Archaeocytes are totipotent cells which can differentiate into other cell types within the body of sponge. … Choanocytes are flagellated cells which line the spongocoel and form the so called ‘choanoderm’: the layer represents endoderm of a diploblastic poriferan organism.

What does a sponge eat?

So how do sponges eat? Sponges are mostly filter feeders and they eat detritus, plankton, viruses and bacteria. They also absorb dissolved nutrients directly from the water through their pinacocyte cells; each cell is responsible for getting their own food!

What are Ostia and osculum?

Ostia are the tiny pores present on the surface of sponges, from where water enters and goes to the spongocoel. The osculum is the opening from where the water goes out after passing through the spongocoel.

What’s the difference between Ostia and porocytes?

Once through the pores, water travels down canals. The opening to a porocyte is a pore known as an ostium. In sponges, like Scypha, there are some cells that have an intracellular pore. These cells are known as porocytes.

What are the function of Osculum?

Answer:The osculum (plural “oscula”) is an excretory structure in the living sponge, a large opening to the outside through which the current of water exits after passing through the spongocoel. Wastes diffuse into the water and the water is pumped through the osculum carrying away with it the sponge’s wastes.

What is the function of Porocytes?

In the Calcarea, the outer surface of the body also contains flattened granular cells called porocytes because they contain the pores needed to allow water into the sponge. The porocytes can contract, thus closing the pores during unfavourable environmental conditions.

What is the Pinacocytes function?

Function. Pinacocytes are part of the epithelium in sponges. They play a role in movement (contracting and stretching), cell adhesion, signaling, phagocytosis, and polarity. Pinacocytes are filled with mesohyl which is a gel like substance that helps maintain the shape and structure of the sponge.

What is spongocoel and its function?

A spongocoel (/ˈspɒŋɡoʊˌsiːl/), also called paragaster (or paragastric cavity), is the large, central cavity of sponges. … amoebocytes – motile cells that perform various digestive functions within the sponge by transporting and/or storing food and excreting waste.