. Injurious insects : how to recognize and control them . Insect pests; Insect pests. Fig. 10. — Spiracles of ;i grasshoppor. Enlarged. Original. higher animals, whoso blood circulates in ar- teries, veins, and capil- laries. In insects the blood flows freely around the internal organs and through the tissues. There is a heart, how- ever, which keeps the blood moving. It is an elongated structure, situ- ated just beneath the u]3per sui-face of the in- sect's body, and consists of a series of chaml)ers, each with valves opening from the laody cavity into the chamlser, and with another valve o]i
. Injurious insects : how to recognize and control them . Insect pests; Insect pests. Fig. 10. — Spiracles of ;i grasshoppor. Enlarged. Original. higher animals, whoso blood circulates in ar- teries, veins, and capil- laries. In insects the blood flows freely around the internal organs and through the tissues. There is a heart, how- ever, which keeps the blood moving. It is an elongated structure, situ- ated just beneath the u]3per sui-face of the in- sect's body, and consists of a series of chaml)ers, each with valves opening from the laody cavity into the chamlser, and with another valve o]ien- ing into the next chamber toward the front. The trachea' are extremely thin walled, and the oxygen that they contain is thus brought to the various tissues. Air circulates slowly in the tracheae. The openings or spiracles are guarded by various devices, such as a fringe of hairs. The Circulatory System The entire body cavity of an insect is bathed in a yellowish or greenish fluid that we speak of as its blood. There is no closed system of blood vessels, as in the. rainmatic.). 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 O'Kane, Walter Collins, b. 1877. New York : The Macmillan Company
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectinsectp, bookyear1912
