Earthworm Dissection

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Anatomy & Physiology

Last updated 5:00 PM on 3/9/26
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17 Terms

1
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<p>What two Structures are in the circled Region? What are the Functions?</p>

What two Structures are in the circled Region? What are the Functions?

Mouth: responsible for taking in food. Prostomium: fleshy lobe that covers the mouth; helps in sensing the environment.

2
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<p>What is this Structure? What is the Function?</p>

What is this Structure? What is the Function?

Ganglia (“brain”): serve as a primitive brain, processing information and controlling the nervous system activities.

3
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<p>What is this Structure? What is the Function?</p>

What is this Structure? What is the Function?

Pharynx: muscular tube that helps in sucking food into the esophagus.

4
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<p>What is this Structure? What is the Function?</p>

What is this Structure? What is the Function?

Esophagus: passageway for food from the pharynx to the crop

5
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<p>What is this Structure? What is the Function?</p>

What is this Structure? What is the Function?

Nephridium: primary excretory and osmoregulatory organs in earthworms; filter nitrogenous wastes (urea, ammonia) and excess fluids from the coelomic cavity.

6
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<p>What is this Structure? What is the Function?</p>

What is this Structure? What is the Function?

Seminal Receptacles: receive and store sperm transferred from another worm during copulation

7
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<p>What is this Structure? What is the Function?</p>

What is this Structure? What is the Function?

Seminal Vesicles: produce, store, and mature sperm (spermatozoa) before they are released during mating

8
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<p>What is this Structure? What is the Function?</p>

What is this Structure? What is the Function?

Heart(s): five pairs of "aortic arches" (often called hearts) that act as pseudo-hearts to pump blood through their closed circulatory system

9
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<p>What is this Structure? What is the Function?</p>

What is this Structure? What is the Function?

Crop: stores ingested soil, organic matter, and food particles

10
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<p>What is this Structure? What is the Function?</p>

What is this Structure? What is the Function?

Gizzard: grinds, crushes, and churns soil and organic matter (food) into smaller particles for better nutrient absorption and digestion

11
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<p>What is this Structure? What is the Function?</p>

What is this Structure? What is the Function?

Dorsal Blood Vessel: main vessel for collecting and pumping blood along the back.

12
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<p>What is this Structure? What is the Function?</p>

What is this Structure? What is the Function?

Intestine: primary site for chemical digestion, nutrient absorption, and soil processing

13
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<p>What is this Structure? What is the Function?</p>

What is this Structure? What is the Function?

Septa: thin, transverse muscular walls that partition the coelom (body cavity) into segments.

14
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<p>What type of Circulatory System?</p>

What type of Circulatory System?

Closed System - Aortic Arches consisting of 5 pseudo-hearts.

15
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<p>What type of Nervous System?</p>

What type of Nervous System?

Central Ganglion on the anterior end; Nerve Cord on the ventral side.

16
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<p>What type of Excretory System?</p>

What type of Excretory System?

Nephridia

17
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<p>What type of Respiratory System?</p>

What type of Respiratory System?

Diffusion through skin