ANATOMY OF THE CIRCULATORY ORGANS.
333. The CIRCULATORY ORGANS are the Heart, Ar´te-ries, Veins, and Cap´il-la-ries.
334. The HEART is placed obliquely, in the left cavity of the chest, between the right and left lung. Its general form 155 is that of an inverted cone, the base of which is directed upward and backward, toward the right shoulder, while its apex points forward to the left side, about three inches from the sternum to the space between the fifth and sixth ribs. Its under side rests upon the tendinous portion of the diaphragm. The heart is surrounded by a sac, called the per-i-car´di-um, (heart-case.) The interior surface of this membrane secretes a watery fluid, that lubricates the exterior of the heart, and obviates friction between it and the pericardium.
331. what is the ultimate object of the food? 332. Of what is the blood composed? What is said of the distribution of the blood? 333. Name the circulatory organs. 334–351. Give the anatomy of the circulatory organs. 334. Describe the heart.
Fig. 66.
Fig. 67.
