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Updated: May 19, 2025
Minute puncture of arteries such as frequently occur in the hypodermic administration of drugs and in the use of exploring needles, are not attended with any escape of blood, chiefly because of the elastic recoil of the arterial wall; a tiny thrombus of platelets and thrombus forms at the point where the intima is punctured.
The blood, flowing through the minute cavities containing these cells, carries those that have been loosened out into the blood stream. Nuclei appear in the red corpuscles at the time of their formation, but these quickly separate and, according to some authorities, form the blood platelets.
It is supposed to result from the breaking down of the white corpuscles, and perhaps also from the blood platelets, when the blood is exposed to unnatural conditions. The formation of the ferment leads in turn to the changing of the fibrinogen into fibrin. Another substance which is necessary to the process of coagulation is the element calcium.
A chronic endocarditis with permanent lesions of the valves may become an acute inflammation with an infectious provocation. It has been shown that even in a few hours after endocarditis has started, little vegetations composed of fibrin, with white blood cells, red blood pigment and platelets, may develop.
The liquid portion of the blood is called the plasma; the small bodies are known as corpuscles. Other round particles, smaller than the corpuscles, may also be seen under favorable conditions. These latter are known as blood platelets. Each one consists of a little mass of protoplasm, called the stroma, which contains a substance having a red color, known as hemoglobin.
Once she turned the sub-stage mirror a bit to catch the light streaming in the window. Brion stood behind her, fists clenched, forceably controlling his anxiety. "What do you see?" he finally blurted out. "Phagocytes, platelets ... leucocytes ... everything seems normal." Her voice was dull, exhausted, her eyes blinking with fatigue as she stared into the tube.
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