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Zorluk: Çok zorHigher Invertebrates: Annelida, Mollusca, Arthropoda, and Echinodermata

In annelids such as the earthworm, nitrogenous wastes are filtered and processed through metanephridia distributed across body segments. Which of the following represents the correct sequential path of metabolic waste fluid through the metanephridial excretory system from the coelom to the exterior environment?

  1. 1Collection of coelomic fluid through the ciliated Nephrostome funnel
  2. 2Selective reabsorption of salts and water within the Convoluted Tubule
  3. 3Accumulation of concentrated nitrogenous waste in the Nephridial Bladder
  4. 4Excretion of fluid waste to the exterior through the Nephridiopore

Cevap

The correct sequence of excretory fluid flow in an annelid metanephridium is: Nephrostome funnel entry → Convoluted tubule reabsorption → Nephridial bladder storage → Nephridiopore exit.
Metabolic excretion in Annelida begins when coelomic fluid is drawn into the ciliated funnel (nephrostome). It then flows through the convoluted nephridial tubule where selective reabsorption occurs, accumulates in the muscular bladder, and is finally expelled to the environment via the nephridiopore.

Adım Adım Çözüm

1
Identify the initial entry point of coelomic fluid into the metanephridium.
Fluid enters via the ciliated nephrostome located in the anterior septum.
Cilia generate a current that draws coelomic fluid containing wastes into the excretory organ.
2
Trace the path of fluid where chemical composition is modified.
Fluid flows along the convoluted tubule for reabsorption.
Capillaries around the tubule reabsorb useful solutes like glucose and salts back into the blood.
3
Determine the site of waste concentration and holding.
Processed urine accumulates in the expanded nephridial bladder region.
The bladder acts as a temporary reservoir prior to periodic voiding.
4
Identify the final exit pore on the body surface.
Urine is expelled through the epidermal nephridiopore.
The nephridiopore opens directly onto the outer body wall to discharge wastes.

Anahtar Kavram

Annelid Metanephridial Excretory System
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Konular

Higher Invertebrates: Annelida, Mollusca, Arthropoda, and Echinodermata

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