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respiratory system
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respiration: animals
How much air do you breathe in a lifetime?
respiratory system of a grasshopper
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diaphragm; breathing
For Students
respiration summary
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Among the most primitive of present-day vertebrates are the cyclostomes (lampreys and hagfishes), the gill structures of which are in the form of pouches that connect internally with the pharynx (throat) and open outward through slits, either by a fusion of the excurrent gill ducts into a single tube (in Myxine) or individually by separate gill slits (in Petromyzon). The gill lamellae of cyclostomes form a ring around the margins of the gill sac, and the series of sacs is supported in a flexible branchial skeleton. The number of paired pouches varies in different forms from six to 14. The ...(100 of 8385 words)

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