Circulatory System

Most of the segmented worms have two main pumping structure called dorsal and ventral blood vessels. The ventral blood vessel moving toward the posterior end provide intestine with blood. Hoever, different segmented worms have different circulatory system. Most of segmented worms have a red pigment that carries oxygen called hemoglobin. Nonetheless, other segmented worms have unpigmented blood, which green pigment carrying oxygen. Yet, circulatory system is what dominated all the segmented worms. It is a system that blood circulate only in the bllod vessels. The blood is not mixed with fluid in the body cavity. There are five ring vessels called hearts, which transport blood to the head and distributed it throughout the body.