Do insects have a circulatory system?

Hemolymph: Hemolymph is the blood of cockroaches composed of colorless plasma and many corpuscles called hemocytes.

The circulatory system in insects:

1. Insects have an open circulatory system that lacks veins and arteries.
2. The hemolymph flows freely through the body lubricating tissues and transporting wastes and nutrients.
3. Yes, insects have a circulatory system.