Elias Boudinot
Published: 2009-08
Total Pages: 114
Get eBook
This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1879 edition. Excerpt: ...lymph and showing Fig. 237. Pulmonary Artery. y1, r 'tw?8?--. Pulmonary Artery. Heart of Crocodile., Veins, ao, Eight Auricle, vt. Ventricles, ap. Pulmonary Arterics, a, A Vessel proceeding from the Ventricle to the Aorta. Off, Left Auricle. pulsations, are called Lymphatic Hearts. In the Frog, two such hearts are situated on the back of the animal, between the joints of the thigh bones. 41S. What animals of this class have the most perfect form of a heart? 419 Whatkind of a portal system do we find among reptiles? 420 Describe lymphatic hearts. 421. Heart of Pishes.--The heart consists of one auricle and one ventricle, which are covered by a pericardium, and the whole organ is very small in proportion to the size of the whole body, being from ijth to Torota it3 weight. In the osseous fishes the heart is elongated and conical, while ia the Sharks and Rays it is broader. The ventricle discharges its blood through the aortic trunk upon the gills. This trunk divides up into a large number of minute branches which ramify upon the gills, and after the blood has received its oxygen from the water, it is collected by a corresponding set of vessels, and emptied into another trunk which supplies all the rest of the body--which trunk corresponds to the aorta--though it has no muscular power to propel the blood along. After it has performed its office it is collected by a system of vessels similar to veins, and returned to the, auricle. 422. Pulsations in a Minute.--Commonly not more than twenty or thirty beat in a minute may be counted in fishes, while in birds one hundred may be counted in the same time. 423. Portal Circulation.--In fishes, as in reptiles, there seems to be a double portal circulation. Circulation in Fishes, a, Heart. 6, ...