. A text-book on physiology : for the use of schools and colleges : being an abridgment of the author's larger work on human physiology. consid-ered as arising from theconjunction of a pairof the preceding form, With their efferent and Diagram of single heart. afferent tubes, or arteries and veins, so modified or ar-ranged that the right heart receives its blood from thesystem in an auricle, from which it passes into a ven-tricle, and thence to the lungs. From the lungs, afteraeration, this blood isbrought to the auricle ofthe left heart, thence intoits ventricle, and thenceto the aorta. Thoug
. A text-book on physiology : for the use of schools and colleges : being an abridgment of the author's larger work on human physiology. consid-ered as arising from theconjunction of a pairof the preceding form, With their efferent and Diagram of single heart. afferent tubes, or arteries and veins, so modified or ar-ranged that the right heart receives its blood from thesystem in an auricle, from which it passes into a ven-tricle, and thence to the lungs. From the lungs, afteraeration, this blood isbrought to the auricle ofthe left heart, thence intoits ventricle, and thenceto the aorta. Though allfour chambers are gener-ally coalesced into oneconical form, the heart ofthe dugong, Fig. 46, pre-sents the true typicalstructure; E is the rightor pulmonary ventricle, Lthe left or systemic ven-tricle, their apices beingquite apart; D is the rightor systemic auricle, F thepulmonary artery, K the left or pulmonary auricle, andA the aorta. Externally, the heart is covered by a serous mem-Describe the diagram, How may the four-chamberedheart be considered as arising ? What is there peculiar in the heartof the dugong ?. Heart of the dugong. 118 COUESE OF THE BLOOD IN THE HEART. brane, pericardium, and in its interior is sheathed by theendocardium, an extension of the interior coat of thegreat blood-vessels. Though its movements are whollyinvoluntary, its muscular fibres are of the transverselystriated kind. They are about one third less in diame-ter than those of voluntary muscles generally, and are es-Fig. 4T. pecially characterized by their disposition toanastomose with oneanother, as represent-ed in Fig. 47. In the
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Keywords: ., bookautho, bookcentury1800, bookdecade1860, booksubjectphysiology
