Sponge Anatomy Quiz

Which cells make up the outer body wall of a sponge?

What is the collagenous substance that provides a supportive matrix under the pinacoderm called?

What are the perforated openings all around sponges called?

What is the name for the central cavity of a sponge?

Which cells make up the inner epithelial layer of a sponge?

What is the name for the flagellated cells in sponges that have a collarlike ring in microvilli along the flagellum?

What is the term for the single external opening of a sponge?

What is the name for the needle-like forms within a sponge that act as the skeleton?

Sponge Anatomy and Structure

The outer body wall of a sponge is primarily composed of pinacocytes which are flat cells that cover the sponge's surface.
The supportive matrix beneath the pinacoderm, made mainly of collagen, is known as the mesohyl.
The numerous perforated openings on the surface of sponges are referred to as ostia, allowing water to enter the sponge.
Sponges have a central cavity called the spongocoel, which serves as a main channel for water flow within the organism.

Cellular Components

The inner epithelial layer of a sponge is made up of choanocytes, which are specialized cells that help in filter feeding.
Choanocytes possess a unique flagellated structure with a collar-like ring of microvilli, facilitating water movement and trapping food particles.

Openings and Structures

The single external opening of a sponge is called the osculum, through which water exits after passing through the sponge.
Sponges contain spicules, which are the needle-like structures providing internal support and contributing to the sponge's skeleton.

Test your knowledge of the anatomy of sponges with this quiz! Learn about the pinacoderm, pinacocytes, mesohyl, ostia, choanoderm, and choanocytes. Challenge yourself with questions about the outer body wall, thin flat cells, collagenous substance, perforated openings, inner epithelial layer, and flagellated cells of these fascinating creatures.