How many pairs of heart-like structures are involved in earthworm circulation?
Answer
Five pairs of aortic arches
The circulatory system of the earthworm, despite its seemingly simple appearance, is quite organized, featuring structures analogous to hearts. Specifically, earthworms possess five distinct pairs of muscular tubes referred to as aortic arches. These structures encircle the esophagus and function to pump the blood throughout the closed circulatory system, ensuring that oxygen, absorbed through the moist skin, and nutrients are distributed efficiently to all parts of the segmented body. This complex arrangement is crucial for maintaining metabolic function in a creature that relies entirely on surface absorption for respiration.
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