By Kara Rogers

ISBN-10: 1615301216

ISBN-13: 9781615301218

Even if its ubiquity within the human physique could make it look unremarkable, easily positioned, blood makes existence attainable. It nourishes cells in the course of the physique and transports carbon dioxide to the lungs. with out it, the physique will be not able to struggle disorder and an infection or functionality in any respect. Readers are invited to keep on with the process this awesome fluid because it circulates in the course of the physique and know about its part components. designated diagrams complement the textual content and make allowance readers a glimpse into the anatomy and life-sustaining houses of human blood.

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Additional resources for Blood: Physiology and Circulation (The Human Body)

Example text

The number of red cells and the amount of hemoglobin vary among different individuals and under different conditions; the number is higher, for example, in persons who live at high altitudes and in the disease polycythemia. At birth the red cell count is high, falling shortly after birth and gradually rising to the adult level at puberty. Hemoglobin Hemoglobin is the iron-containing protein found in the red blood cells that transports oxygen to the tissues. Hemoglobin forms an unstable, reversible bond with oxygen.

When they are suspended in very dilute (hypotonic) solutions of sodium chloride, red cells take in water, which causes them to increase in volume and to become more spheroid. In concentrated salt solutions, they lose water and shrink. The red blood cell develops in bone marrow in several stages. From a hemocytoblast, a multipotential cell in the mesenchyme, it becomes an erythroblast (normoblast). During two to five days of development, the erythroblast gradually fills with hemoglobin, and its nucleus and mitochondria (particles in the cytoplasm that provide energy for the cell) disappear.

Monocytes are actively motile and phagocytic. They are capable of ingesting infectious agents as well as red cells and other large particles, but they cannot replace the function of the neutrophils in the removal and destruction of bacteria. Monocytes usually enter areas of inflamed tissue later than the granulocytes. Often they are found at sites of chronic infections. In the bone marrow, granulocytes and monocytes arise from a common precursor under the influence of the granulocyte-macrophage colony-stimulating factor.

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Blood: Physiology and Circulation (The Human Body) by Kara Rogers


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