Dorsal

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Blackworm Circulation
Dorsal
Contracting muscles
Posterior
Anterior
Ventral
Narrow, pointy
Wide, blunt dark in color
Lateral vessels found in each body segment
Blood Flow
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Closed circulatory system- blood travels
throughout body in vessels
Open circulatory system- fluids not not carried
in vessels, pumped over organs in body cavity
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• Why is a circulatory system important?
• delivers oxygen and food to cells need to make
  energy(cellular respiration)
• removes wastes