Animalscaretips
- What does spongin mean in science?
- Which produces makes the spongin in a sponge?
- What is the function of spongin and spicules in a sponge?
- What is the Osculum in a sponge?
- Do all sponges have spongin?
- What is the function of a Choanocyte?
- What is the function of Mesohyl?
- What do Poriferans eat?
- Which is special feature of porifera?
- Does porifera have true tissue?
- How Spongin is formed?
- What is Mesohyl or mesenchyme?
- What is the function of Archaeocytes in a sponge?
What does spongin mean in science?
Definition of spongin
: a scleroprotein that is the chief constituent of flexible fibers found in certain sponge skeletons.
Which produces makes the spongin in a sponge?
Amoebocytes can also give rise to sclerocytes, which produce spicules (skeletal spikes of silica or calcium carbonate) in some sponges, and spongocytes, which produce the protein spongin in the majority of sponges.
What is the function of spongin and spicules in a sponge?
Besides supporting sponge cells, spicules can help larvae stay buoyant while in the plankton or reach the bottom at settlement, enhance reproduction success, or catch prey.
What is 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.
Do all sponges have spongin?
The presence and composition of spicules and spongin are the differentiating characteristics between the classes of sponges. Demosponges, which contain spongin and may or may not have spicules, constitute about 90% of all known sponge species, including all freshwater ones, and have the widest range of habitats.
What is the function of a Choanocyte?
Choanocytes join together creating the choanoderm, where they perform two major functions. The first is to create a flow of water and the second is to capture food items as they pass by these cells. The flow of water is initiated through the coordinated beating of flagella.
What is the function of Mesohyl?
The mesohyl acts as a type of endoskeleton, helping to maintain the tubular shape of sponges.
What do Poriferans eat?
The Porifera are primarily filter feeders, utilizing food particles suspended in the water and captured by the choanocytes. Food particles consist essentially of bacteria, other microorganisms, and particles of organic debris; sponges also probably absorb dissolved organic substances.
Which is special feature of porifera?
Characteristic Features of Phylum Porifera
They are generally marine aquatic organisms, with a few freshwater species. Their bodies are asymmetrical. Body shape can be cylindrical, vase-like, rounded or sac-like. They are diploblastic animals with two layers, the outer dermal layer and the inner gastral layer.
Does porifera have true tissue?
They are multicellular but do not have tissues or organs. The name porifera means 'pore bearer' in Latin. The surface of the sponge's body is covered by a skin, one cell thick.
How Spongin is formed?
Development of spongin
Spongin fibers are secreted by flask-shaped mesenchyme cells called as spongioblast cells. During the development the spongioblast cells are arranged in the rows and the spongin rods secreted by them are fused with the neighboring cells to form a long fiber.
What is Mesohyl or mesenchyme?
The mesohyl, formerly known as mesenchyme or as mesoglea, is the gelatinous matrix within a sponge. ... These polypeptides form the extracellular matrix which provides the platform for specific cell adhesion as well as for signal transduction and cellular growth.
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.
