Nephridia

Definition

Nephridia are excretory organs found in many invertebrates, including molluscs and annelids. They function similarly to kidneys by removing metabolic wastes from the body.

5 Must Know Facts For Your Next Test

1. Nephridia are tubular structures that filter bodily fluid to remove waste products.
2. Two main types of nephridia exist: protonephridia and metanephridia.
3. Protonephridia contain flame cells that help drive waste through the tubules.
4. Metanephridia have an open funnel called a nephrostome that collects coelomic fluid.
5. Nephridia play a crucial role in osmotic regulation by balancing water and salts within the organism.

Review Questions

• What are the two main types of nephridia and how do they differ?
• How do nephridia contribute to osmotic regulation in invertebrates?
• Describe the role of flame cells in protonephridial systems.

Related terms

Metanephridia: Excretory organs with an open funnel (nephrostome) that collect coelomic fluid for filtration

Protonephridia: Excretory structures comprising networks of tubules capped by flame cells for waste removal

Flame Cells: Specialized cells within protonephridial systems that help propel waste through the tubules