What is the function of Ostia and oscula?
Answer: Ostia are tiny pores present all over the body of sponges. its function is to let the water, along with desire nutrient flows interior of the sponges. Osculum is a excretory structure opening to the outside through which current of water exist after passing through the spongocoel.
What is the function of the osculum in a sponge quizlet?
Osculum: A large opening in a sponge through which water flows out of the sponge. Describe how a sponge feeds and digests its food. You just studied 167 terms!
What is the function of Ostia in porifera?
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 spongocoel in sponges?
Answer: Water is pumped directly through pores, called ostia, into the spongocoel and then out of the sponge through an opening called the osculum (plural oscula). The spongocoel is lined with specialized digestive cells called choanocytes that filter and take in food.
What is the difference between Ostia and Oscula?
Ostia are small pores that take in water on sponges. Osculum is the larger openings of a sponge where the water that has been absorbed by the sponge is then released.
What are the three functions of the choanocytes?
The choanocytes carry out a variety of functions including circulation, capturing food, and assisting with reproduction. The movement of the flagellum creates water currents that aid in circulation.
What are two functions of Amoebocytes?
Amoebocytes have a variety of functions: delivering nutrients from choanocytes to other cells within the sponge, giving rise to eggs for sexual reproduction (which remain in the mesohyl), delivering phagocytized sperm from choanocytes to eggs, and differentiating into more-specific cell types.
What are Ostia?
Ostia are the inhalant pores in the body of sponges. Water enters the body of sponges through ostia and reaches the spongocoel. It then flows out of the body through osculum. Ostia is present only in sponges i.e. phylum Porifera as sponges have a porous body.
What are the functions of spicules among sponges?
The mineral skeleton is formed for the most part by units called spicules, either scattered throughout the sponge or united to form fibres; spicules are classified as megascleres, which function in support, and microscleres, which function in protection and also aid in support.
What is 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.
Do all sponges have Choanocytes?
Choanocytes (“collar cells”) are present at various locations, depending on the type of sponge, but they always line the inner portions of some space through which water flows (the spongocoel in simple sponges, canals within the body wall in more complex sponges, and chambers scattered throughout the body in the most …
What are Amoebocytes and what do they secrete?
Amoebocytes are amoeba like cells found in sponges. They are totipotent (able to divide and form differentiate cells) in nature. They basically store, digest and transport food, excrete wastes, secrete skeleton and also may give rise to buds in asexual reproduction.
How do Amoebocytes move?
Amoebocytes are motile cells found in the Phylum Porifera (sponges) and similar organisms such as starfish, sea urchins, snails and mollusks. As the name implies, these cells resemble an amoeba, moving around by extending their cytoplasm (called pseudopodia, meaning ‘false feet’).
