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The blood circulating through the body is of two different kinds; the one red or arterial, and the other dark or venous blood. The former alone is capable of affording nourishment and supporting life.
Moreover, the internal traffic of Ireland, by rail, waterways, and canals is capable of and needs great development, as witness the recent Reports of the Viceregal Commission on Irish Railways, and of the Royal Commission on Canals and Waterways. The problem of inland navigation is again intimately bound up with that of arterial drainage, as the Commissioners have reported.
If the quantity be small, the loss will be comparatively little, as the spirit will be held in solution by the water in the blood. After it has passed through the lungs, and has been driven by the left heart over the arterial circuit, it passes into what is called the minute circulation, or the structural circulation of the organism.
All this is found the same in reptiles: except that the partition, which separates our two ventricles from each other, does not exist in them; and the heart has only one common room, in which, therefore, arterial and venous blood become mixed together.
The blood then enters minute venous ramifications, which gradually coalesce into larger branches, and at last terminate in four large trunks in the left side of the heart, whence the blood, in its arterial form, is again distributed over the body, to pursue the same course and undergo the same change as before.
Matas suggests infolding the wall of the vessel with interrupted sutures that do not pierce the intima, and wrapping it round with a strip of peritoneum or omentum. The most serious form of arterial thrombosis is that met with in the abdominal aorta, which is attended with violent pains in the lower limbs, rapidly followed by paralysis and arrest of the circulation.
The return flow of the blood to the heart through the veins is sluggish and stagnant because the force from behind, that is, the arterial blood pressure, is obstructed by the uric acid which clogs the minute capillaries that form the connection between the arterial and the venous systems.
I was sort of a kid then; but think of old Joe bein' down in bed sick! Why, I ain't never been sick a day in my life. Sick? I'd laugh myse'f plumb to death if anybody ever wanted me to go to bed. What's the matter with him, anyway?" "His nerves are a bit shaken about," responded the doctor. "To which I might add that there is superimposed an arterial condition "
I am certain that it is doing this, because there is no indication of an escape of arterial blood into the thoracic cavity; in other words, the mouths of the two aortal wounds have seized upon the blade with a firm hold and thus prevent it from slipping in and out. This is a very fortunate occurrence, but one which will cause pain for some time.
These two great venous trunks are the inferior vena cava, bringing the blood from the trunk and the lower limbs, and the superior vena cava, bringing the blood from the head and the upper limbs. These two large trunks meet as they enter the right auricle. The four pulmonary veins, as we have learned, carry the arterial blood from the lungs to the left auricle.
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