What are the specialized cells called that line the pores of a sponge's body?

The specialized cells that line the pores of a sponge's body are known as choanocytes. These cells play a crucial role in the sponge's feeding mechanism. Choanocytes have fine, hair-like structures called flagella that they use to create a water current through the sponge's body. As water passes over the choanocytes, they can filter out food particles such as bacteria and phytoplankton, which are then absorbed by the cells for energy and nourishment.

In contrast, amoebocytes are involved in various functions within the sponge's body, including transporting nutrients and waste removal, but they do not specifically line the pores. Chondrocytes and osteocytes are specialized cells found in cartilage and bone tissue, respectively, and are not relevant to sponge anatomy. Thus, choanocytes are the key cells responsible for the sponge's unique feeding structure, highlighting their essential role in the sponge's biology.