explain why the blood flows at a slow speed in animals having open circulatory system. give one exmple of such animal

Hi Hafeez,
Please find below the solution to the asked query:

Blood flows at slow speed in animals with open circulatory system because they lack blood vessels.  The blood falls directly in cavities of the body that also reduces its speed.

Note: The blood vessels present in animals with closed circulatory system contain smooth muscles which are responsible for contraction of these vessels that increases the speed of the blood in them.

Hope this information will clear your doubts about the slow speed of blood in animals with open circulatory system.
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Regards
 

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with open circulatory system,it takes time for the blood to diffuse through the walls of arteries and veins,at the sinus.
ex: cockroach
 
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