. The anatomy and physiology of the human body. Containing the anatomy of the bones, muscles, and joints; and the heart and arteries. use it distributes blood to the wholebody; and in form, because it no sooner swells out into theshape of an aorta than its coats grow hard, strong, muscular,fit for its office, while those of the veins from which it isformed are pellucid, delicate and very tender. The aortais full of the oxydated blood of the gills; and although, bythe delicate circulation of the gills, it has lost all communi-cation with the heart, it circulates this oxydated blood through OF R
. The anatomy and physiology of the human body. Containing the anatomy of the bones, muscles, and joints; and the heart and arteries. use it distributes blood to the wholebody; and in form, because it no sooner swells out into theshape of an aorta than its coats grow hard, strong, muscular,fit for its office, while those of the veins from which it isformed are pellucid, delicate and very tender. The aortais full of the oxydated blood of the gills; and although, bythe delicate circulation of the gills, it has lost all communi-cation with the heart, it circulates this oxydated blood through OF RESPIRATION. 17 ikic body to all the muscles, glands, viscera, kc. without theintervention of a new lieart. The veins which return the blood of this aorta are the or-dinary veins ; tluy arrive in two great branches at the heart,and need not be further explained. I will not be at the trouble to repeat the tedious calculationsof authors concerning the immense surface which the gills ex-pose ; let the student look to the gills, and he will presently,with the help of tiiis short sketch, understand how the whole:function oes on. I77i. StiffTnzcui •JlFTH SPECIES or RESPIRATION, VIZ. THAT OF INSECTS; There is in this kind of respiration no breathing organ like♦he lungs, but tracheas or air tubes by which air enters intoall parts of their body. What is most perplexing in this species of respiration is theDrodigious quantity of air which these creatures receive ; thelittle connexion between the air tubes and the heart; the im-possibility of tracing blood vessels from the heart to thevarious parts to nourish them ; and the clearness with whichwe see their air tubes branching over all parts of their stomach, bowels, and other viscera, the legs and wings,even the very scales of insects, have branches of the airtubes dividing over their surfaces like the delicate vessels ofJeaves and flowers. In short, the magnitude of these airtubes is quite surprising ; and their branchings ar
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Keywords: ., bookcentury1800, bookdecad, booksubjecthumananatomy, bookyear1822
