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Arthropods are "always bleeding internally" because in order to bring vital substances to every cell in the body, a heart in the dorsal (upper) region of the body pumps blood into short vessels that empty out into different cells in the body. This allows blood to flow right over all of the cells in that cavity. In a sense, since the blood flows over all the cells, it is constantly bleeding internally.

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10y ago
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Q: Why do people say that arthropods are constantly bleeding internally?
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