Earthworm Dissection

This dissection introduces students to the anatomy of the earthworm, a segmented worm with well-developed digestive, circulatory, reproductive, excretory, and nervous systems. The activity highlights both external and internal features, making it an effective introduction to animal anatomy.

• Follow instructions provided in the links below.

Biology 1101 Lab 1 || Earthworm Dissection - aceconnect:

Earthworm Dissection - Biologybyme:

📄 Earthworm Dissection - Carolina: [[https://www.carolina.com/teacher-resources/Interactive/earthworm-dissection/tr10714.tr?srsltid=AfmBOop9VCEF0VrylqNaPnL7-9iAkJL6jU56Vt7ay0S0KhJi9N0SJxyV]

• Compare earthworm anatomy with crayfish to study open vs. closed circulatory systems.
• Use microscopes to examine cross-sections of worm tissue.
• Trace the path of food through the digestive system using diagrams.

• Gloves, goggles, and lab coat required.
• Use dissecting scissors instead of scalpels for safety.
• Cut shallowly to avoid damaging internal organs.
• Dispose of specimens and waste according to lab guidelines.
• Wash hands and disinfect equipment after use.

• What structures help the earthworm move through soil? (Setae provide grip and traction.)
• How does the earthworm’s circulatory system differ from that of insects? (Earthworms have a closed system with vessels and aortic arches, unlike the open system of insects.)
• What is the role of the gizzard in digestion? (It grinds food before it enters the intestine.)
• Why are earthworms considered hermaphrodites? (They possess both male and female reproductive organs.)
• How do earthworms contribute to soil health? (They aerate the soil and recycle nutrients through digestion and excretion.)