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

In an earthworm (phylum Annelida), ingested organic matter moves sequentially through specialized regions of the alimentary canal. What is the correct order of these anatomical structures from the anterior (front) to the posterior (rear) end?

  1. 1Pharynx
  2. 2Crop
  3. 3Gizzard
  4. 4Intestine

Cevap

The correct sequential order of the earthworm alimentary canal from anterior to posterior is Pharynx, followed by Crop, then Gizzard, and finally Intestine.
In the annelid digestive plan (earthworm), food enters the mouth, passes through the pharynx, travels down the esophagus into the crop for storage, moves into the gizzard for mechanical grinding, and finally enters the intestine for enzymatic digestion and absorption.

Adım Adım Çözüm

1
Identify the entry point of the alimentary canal after the mouth.
The pharynx is the muscular organ right behind the mouth at the most anterior position.
Food is sucked into the digestive tract through the pharynx.
2
Identify the storage region prior to mechanical digestion.
The crop is located posterior to the esophagus and pharynx.
The crop stores food temporarily before it passes into the grinding organ.
3
Determine the mechanical grinding organ following storage.
The gizzard immediately succeeds the crop.
The thick muscular wall of the gizzard uses soil particles to grind food after storage.
4
Identify the primary absorption region leading to the anus.
The intestine extends from the gizzard to the posterior end.
Extensive digestion and nutrient absorption occur along the length of the intestine.

Anahtar Kavram

Annelid Digestive System Anatomy
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Konular

Higher Invertebrates: Annelida, Mollusca, Arthropoda, and Echinodermata

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