рагҳои хунгард: blood vessels
Blood vessels are spread through our whole body.
Ҳаракати хунро дар рагҳои хунгард гардиши хун меноманд.
The movement of blood in the blood vessels is called circulation.
If you want to know what your eye colour says about your personality read this article from Tajikistan times.
When making a noun plural, generally the suffix ҳо is used for inanimate objects, and the suffix он is used for animals and people. There are a few exceptions. Some body parts can take the suffix он, for example чашмон (eyes) and китфон (shoulders). A few other inanimate objects can take the suffix он, for example ситорагон (stars) and дарахтон (trees).
Note that colloquially, ҳо is used for animals and people, as well as for inanimate objects.