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Questions and Answers
Which cells make up the outer body wall of a sponge?
Which cells make up the outer body wall of a sponge?
- Choanocytes
- Spicules
- Pinacocytes (correct)
- Oscula
What is the collagenous substance that provides a supportive matrix under the pinacoderm called?
What is the collagenous substance that provides a supportive matrix under the pinacoderm called?
- Ostia
- Spongocoel
- Choanoderm
- Mesohyl (correct)
What are the perforated openings all around sponges called?
What are the perforated openings all around sponges called?
- Spicules
- Choanocytes
- Oscula
- Ostia (correct)
What is the name for the central cavity of a sponge?
What is the name for the central cavity of a sponge?
Which cells make up the inner epithelial layer 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 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 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?
What is the name for the needle-like forms within a sponge that act as the skeleton?
Flashcards
Pinacocytes
Pinacocytes
Cells forming the outer body wall of a sponge.
Mesohyl
Mesohyl
A collagenous, supportive matrix beneath a sponge's pinacoderm.
Ostia
Ostia
Small pores all over a sponge's surface for incoming water.
Spongocoel
Spongocoel
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Choanocytes
Choanocytes
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Osculum
Osculum
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Spicules
Spicules
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Study Notes
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.
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