Do annelids have a closed circulatory system?

Closed circulatory system of Annelids:

1. In closed circulatory system, blood flows through closed channel in which blood vessels, capillaries and heart regulates the blood.
2. Blood glands are present on fourth, fifth and sixth segments in annelids.
3. Blood glands produce blood cells and hemoglobin which is dissolved in plasma.
4. Annelids possess a closed circulatory system.