Class-book of physiology : for the use of schools and families : comprising the structure and functions of the organs of man, illustrated by comparative reference to those of inferior animals . ans is called its circulation. 54. If we commence with those animals which are low- What the number? Under what circumstances is the iron found to bediminished ? What is the remedy in such cases? In what vital process dothe blood discs perform an important office? What elements is the bloodfound to possess by chemical analysis? What does the blood carry to everypart of the system? What does the blood ta
Class-book of physiology : for the use of schools and families : comprising the structure and functions of the organs of man, illustrated by comparative reference to those of inferior animals . ans is called its circulation. 54. If we commence with those animals which are low- What the number? Under what circumstances is the iron found to bediminished ? What is the remedy in such cases? In what vital process dothe blood discs perform an important office? What elements is the bloodfound to possess by chemical analysis? What does the blood carry to everypart of the system? What does the blood take up and carry off? Whatis the circulating apparatus? What the circulation ? What is the conditionof the circuatory apparatus in different, orders of animals? 80 CLASS-BOOK OF PHYSIOLOGY. est in the scale of organization, we shall find the apparatusfor circulating the blood exceedingly simple, though itbecomes more and more complicated as we ascend tohigher orders. 55. In insects, the blood is sent to various parts of thebody by the alternate contractions of clifferent portions ofa central vessel which runs along the back, and thus formsa rudimentary heart. {Fig. 5, and fig. 1, Pl. I.).
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