The school and farmA treatise on the elements of agriculture . h a valve tothe left ventricle. The left ventricle discharges it in-to an artery, a large bloodvessel, which carries it tothe lungs. These consist of two parts, the right andthe left, each containing many thousands of cells. Asthe blood spreads through the lungs, it loses its badelement, the carbonic acid, which is breathed out, andreceives a new supply of oxygen from the air breathedin. It is then ready to return to the heart, which willpump it into the bloodvessels called arteries, and thussend it into every part of the body. The
The school and farmA treatise on the elements of agriculture . h a valve tothe left ventricle. The left ventricle discharges it in-to an artery, a large bloodvessel, which carries it tothe lungs. These consist of two parts, the right andthe left, each containing many thousands of cells. Asthe blood spreads through the lungs, it loses its badelement, the carbonic acid, which is breathed out, andreceives a new supply of oxygen from the air breathedin. It is then ready to return to the heart, which willpump it into the bloodvessels called arteries, and thussend it into every part of the body. The renewed andhealthy bleed that comes from the lungs enters theright auricle of the heart, from which it flows into theright ventricle and thence into the large arteries. Thesearteries, the same as the veins, end in a mass of capil- SCIENCE AND AGRICULTURE. laries which join the other set of capillaries, so thatthe circle of movement goes right on, and continues aslong as the life of the body. This entire circular move-ment requires only one-half of a Fio. 29 —The Position op the Lungs and Heart in the , B, C, D.—fieart. 2.—Pulmonary Artery. 6.—Juj^nilar Vein. E, F.—Lunps. 3.—Aorta. 7.—Windpipe. G.—Diaphrap;m. 4.—Superior Vena Cava. 8.—Larynx. 1.—Pulmonary Vein. 5.—Carotid Artery. 9.—Coronary Artery. Illustration:— 29. The heart, lungs and diaphragm. 30. The lungs, windpipe, larynx and bronchial tubes. 31. Chart of the circulation of the blood. It is very easy to see that a healthy heart and vigor-ous lungs are necessary to secure the best results ofthis renewal of blood. Full, vigorous breathing will AGRICULTURAL PHYSIOLOGY. 189 secure the separation of the carbonic elements fromthe blood, and the mingling of health giving oxygenwith it. The heart must be sound to fulfill its work asthe great pump to secure an even flow through the sys-tem. In order that it may act freely and with the
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