What creates currents to draw water into sponges?

The essential elements of the water-current system include the pores, or ostia, through which water enters the sponge (incurrent system); the choanocytes, or collar cells, which are flagellated cells that generate water currents and capture food; and the oscula, openings through which water is expelled (excurrent …

Which cells produce water currents in sponges?

The feeding chambers inside the sponge are lined by choanocytes (“collar cells”). The structure of a choanocyte is critical to its function, which is to generate a directed water current through the sponge and to trap and ingest microscopic food particles by phagocytosis.

How do collar cells create water currents?

Collar cells each have a flagellum. The movement of the flagella of all the collar cells in the sponge creates a current that draws water-containing food into the sponge through the ostia. The volume of water that passes through the sponge is quite large.

What is the function of choanocytes?

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.

Where are choanocytes found in sponges?

spongocoel
Location. Choanocytes are found dotting the surface of the spongocoel in asconoid sponges and the radial canals in syconoid sponges, but they comprise entirely the chambers in leuconoid sponges.

What features do Choanoflagellates have in common with choanocytes in sponges?

There are striking physical resemblances between choanoflagellates and certain animal cells, specifically the feeding cells of sponges, called choanocytes. Sponge choanocytes also have a flagellum and possess a collar of filaments for trapping food. Similar collars have been seen on several kinds of animals cells.

Where are the choanocytes in sponges present?

Location. Choanocytes are found dotting the surface of the spongocoel in asconoid sponges and the radial canals in syconoid sponges, but they comprise entirely the chambers in leuconoid sponges.

Which cells produce water current in Leucosolenia and other sponges?

The water current is created by flagella attached to choanocytes. Choanocytes are cells that line the spongocoel (that is, the central cavity of the sponge). The outer body wall consists of thin, flat cells called pinacocytes.

How do choanocytes cause water to flow through a sponge?

Choanocytes line internal chambers, the spongocoel, and the beating of their flagella draws water into the animal and expels it. Small food particles suspended in the water stream are captured by the action of the collars on the choanocytes.

How are sponge spicules secreted Sclerocytes?

In sponges they secrete calcareous or siliceous spicules which are found in the mesohyl layer of sponges. The sclerocytes produce spicules via formation of a cellular triad. The triad of cells then undergo mitosis, creating six sclerocytes. In pairs, the sclerocytes secrete the minerals which create the spicules.

What do Choanocytes in sponges do?

The structure of a choanocyte is critical to its function, which is to generate a water current through the sponge and to trap and ingest food particles by phagocytosis.

Where are Choanocytes found in sponges?