The Bloodworm - cardiovascular systems

Parasites in the cardiovascular system - ScienceDirect

Bloodworms - Cardiovascular

What is the reason why worms have a closed circulatory system? - Quora

PDF) A Review of the “Open” and “Closed” Circulatory Systems: New Terminology for Complex Invertebrate Circulatory Systems in Light of Current Findings

Nervous circulatory and respiratory systems of insects

Mass transport in animals

A multiscale approach reveals elaborate circulatory system and intermittent heartbeat in velvet worms (Onychophora)

Earthworm_circulation

Annelid - Respiratory, Segmented, Setae

PHYSG Exam 2 Flashcards