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Zorluk: OrtaHigher Invertebrates: Annelida, Mollusca, Arthropoda, and Echinodermata

Organize the following structures of the earthworm's (Annelida) digestive tract in the correct sequential order through which ingested organic matter passes.

  1. 1Muscular pharynx
  2. 2Thin-walled crop
  3. 3Thick-walled gizzard
  4. 4Long intestine

Cevap

The correct sequence of structures through which food moves in an earthworm's alimentary canal is: Muscular pharynx, Thin-walled crop, Thick-walled gizzard, and Long intestine.
In earthworms (phylum Annelida), the digestive pathway follows a specific anteroposterior sequence: swallowed food passes through the pharynx and esophagus into the crop for storage, then into the gizzard for mechanical trituration, and finally into the intestine where chemical digestion and nutrient absorption take place.

Adım Adım Çözüm

1
Identify the initial organ of ingestion following the mouth.
Organic material and soil are pulled in by the muscular pharynx.
The pharynx creates suction to ingest soil and organic particles.
2
Identify the organ used for temporary food storage.
Ingested material travels down the esophagus into the crop.
The thin-walled crop holds food temporarily before mechanical digestion.
3
Determine the organ responsible for mechanical grinding.
Food moves from the crop into the gizzard.
The muscular gizzard uses ingested mineral grains to grind food into small particles.
4
Identify the final site of enzymatic digestion and absorption.
Pulverized food enters the long intestine.
Enzymatic digestion and nutrient absorption occur across the intestinal epithelium before undigested waste exits the anus.

Anahtar Kavram

Annelid Alimentary Canal Structural Sequence
Tahmini Süre:1m 0s
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Konular

Higher Invertebrates: Annelida, Mollusca, Arthropoda, and Echinodermata

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