* Metanephridia: These are paired, tubular excretory organs found in each segment of the worm.
* Nephrostome: A funnel-shaped opening at the beginning of each metanephridium, located in the coelom (body cavity) of the segment. This opening collects waste products.
* Nephridiopore: A small opening at the end of each metanephridium, located on the exterior of the worm. This is where the waste is excreted.
* Tubule: The main part of the metanephridium, where waste is filtered and processed.
How it works:
1. Waste products from the coelom (body cavity) are collected by the nephrostome.
2. The waste passes through the nephridial tubule, where it's filtered and processed.
3. The filtered waste is then passed out of the body through the nephridiopore.
Key points:
* The metanephridial system is very efficient at removing waste products from the body, including nitrogenous waste (like ammonia) and excess water.
* This system helps annelids to maintain their internal environment (homeostasis).
Let me know if you want to know more about the specifics of the filtration process in metanephridia!
