This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1888 Excerpt: ...many as five millions. Their Use in the Body. The red corpuscles may be compared to little circular boats floating in the water of the blood. They go to the lungs, where they get very near the air, and take from it all the oxygen they can carry. Then they hasten away to some distant part of the body where some tissue needs it. To such tissue the corpuscles give up their oxygen while they are going through the capillaries; then they hasten back to the lungs for another load. For this reason, the red corpuscles are called oxygen-carriers. Arterial Blood. When these corpuscles have a great deal of oxygen in them, or when they have just left the lungs, they are bright in color, and they make the whole blood appear bright scarlet. This bright-colored blood is found in the arteries, hence it is called arterial blood. The Pulmonary Veins. There is one place where this bright blood is found in the veins; namely, in the vessels that carry the blood from the lungs to the left side of the heart. These vessels are called the pulmonary veins. Venous Blood. After the corpuscles have passed through the capillaries, and have there given up their oxygen to the tissues, they become darker, and as a result the whole blood looks darker. Dark blood is found in the blood-vessels which extend from the capillaries through the body and back to the lungs. The Pulmonary Artery. The pulmonary artery carries blood from the right side of the heart to the lungs. It must, therefore, contain venous blood. We say that the arteries contain arterial blood, and the veins venous blood; but to this rule there are the two exceptions we have just given, in the cases of the pulmonary artery and the pulmonary veins. The Air. The air we breathe consists principally oi two gases,--oxygen and nitrogen....
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