. Elements of zoölogy : a textbook. Zoology. HEXAPODA: RESPIRATORY SYSTEM, ETC. 293 palpi are slender, jointed organs, very flexible and sensi- tive. A highly developed circulatory system is wanting ; but just under the covering of the back there is a long tube which is called the heart, and this organ performs regular alternate movements of contraction and dilatation. The blood enters this tubular organ by openings along its sides, the openings being furnished with valves which prevent its return, and the blood escapes at the forward end as the organ contracts, and thus the blood is kept in m
. Elements of zoölogy : a textbook. Zoology. HEXAPODA: RESPIRATORY SYSTEM, ETC. 293 palpi are slender, jointed organs, very flexible and sensi- tive. A highly developed circulatory system is wanting ; but just under the covering of the back there is a long tube which is called the heart, and this organ performs regular alternate movements of contraction and dilatation. The blood enters this tubular organ by openings along its sides, the openings being furnished with valves which prevent its return, and the blood escapes at the forward end as the organ contracts, and thus the blood is kept in motion throughout the interior of the animal. The blood of In- sects is colorless, and it nils all the interior of the animal FIG. Cross section of an insect—Bee - showing position of stigmata, air tubes, etc. st, stigmata opeuing into the trachese; dn, dorsal vessel or heart; ac, alimentary canal; ng, nevous ganglia. not occupied by internal organs, and it permeates the tis- sues of the organs themselves. The respiratory system is very different from that of the. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Tenney, Sanborn, 1827-1877. New York : Scribner
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