What is pinacocytes cell?

Definition of pinacocyte : one of the flat cells covering the external surface and lining the incurrent and excurrent canals of sponges.

What are Porocytes and their function?

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 are pinacocytes and choanocytes?

Choanocytes are body cells of sponges and pinacocytes are flat shaped cells that make up the pinacoderm of sponges. The key difference between choanocytes and pinacocytes is that choanocytes contain flagella while pinacocytes do not contain flagella. Sponges belong to the phylum Porifera.

What is the function of Archaeocytes in a sponge?

Functions. Cellular differentiation is an essential function of the archaeocyte. All specialized cells within the sponge have its origins with the archaeocyte. This is especially important in reproduction as the sex cells of the sponge in sexual reproduction are formed from these amoeboid cells.

What are Pinacocytes made of?

Pinacocytes, which are epithelial-like cells, form the outermost layer of sponges, enclosing a jelly-like substance called mesohyl. Mesohyl is an extracellular matrix consisting of a collagen -like gel with suspended cells that perform various functions.

What is the function of the Osculum in a sponge?

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 are Porocytes short note?

Definition of porocyte : one of the large tubular cells that constitute the wall of the incurrent canals in some sponges.

What does the Osculum do?

What is the function of Osculum?

Why are Ostia important to sponges?

Scattered among the pinacoderm are the ostia that allow entry of water into the body of the sponge. These pores have given the sponges their phylum name Porifera—pore-bearers. In some sponges, ostia are formed by porocytes, single tube-shaped cells that act as valves to regulate the flow of water into the spongocoel.

What is the function of osculum?

What is the meaning of Archaeocytes?

Definition of archaeocyte : an indifferent commonly amoeboid interstitial cell specifically : any of certain amoebocytes of sponges that have large nuclei and blunt pseudopods, are believed to be persistent undifferentiated embryonic cells, and develop into the sex cells.

What is the function of pinacocytes in sponges?

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 the difference between chochoanocytes and pinacocytes?

Choanocytes are cells with a flagellum that line the interior of sponges. Pinacocytes are flat cells present in the outer most cell layer of sponges.

What is pinpinacocyte in Porifera?

pinacocyte In Porifera, one of the flattened cells which comprise the outer surface and which can be expanded or contracted at their margins to allow the whole animal to alter its size slightly.