Question

how blood vascular system in nereis decribe in brief​

Answer 1

Nereis, has a primitive circulatory system in which the blood is propelled by slow peristaltic waves.

In general, the blood moves forward in the dorsal vessel and rearward in the ventral vessel.

The parapodia are the main respiratory organs, and capillary beds invest these very densely, but there is no definite propulsion of blood toward them or through them. There is little central control of the flow of blood.

In particular, the oxygenated blood from the parapodia is simply mixed with other blood.

It may return to the parapodia, move to an active muscle, or enter the longitudinal vessel and be moved to another segment.

Answer 2

The Nereis is a sandworm the description of the blood vascular system of Nereis is as follows:

Explanation:

• The blood vascular system in Nereis is a close type this consists of blood and blood vessels.
• The heart is absent in Nereis.
• The blood is red in color because of the pigment erythrocruorin.
• The dorsal blood vessel is the main collecting vessel for blood that end above the alimentary canal.
• The ventral blood vessel is the blood vessel that transfers the blood below the alimentary canal.
• The dorsal and ventral vessels are connected through the capillary network.
• The blood is circulated in the body of the worm by contraction of the dorsal blood vessels.

Learn more about blood vessels:

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