Roundworms have no heart or formal blood vessels.
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Roundworms have a simple circulatory system with a dorsal blood vessel that runs the length of the body and pumps nutrients and oxygen to the tissues. The blood is not contained within vessels but rather flows freely in the body cavity. Gas exchange occurs through diffusion across the body wall.
Their circulartion system is very similar to humans (closed circulatory system)
Roundworms have a cylindrical body shape with a distinct head and tail. They have a digestive system that runs through the length of their body and a nervous system with a simple brain. Their bodies are covered by a cuticle that helps protect them.
Animals that use lungs for breathing typically have a closed circulatory system. This means that blood circulates through a network of vessels and the heart, allowing for efficient oxygen delivery to tissues and carbon dioxide removal. The closed circulatory system is more effective at maintaining high metabolic rates compared to open circulatory systems found in some invertebrates.
Roundworms.
The scientific name for roundworms is "nematodes."