BISC 104Lxg Lecture 15: Notes - Blood
8 Mar 2017
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Plasma: liquid that makes up about 55% of blood. Composition of plasma: 93% water, 7% consists of dissolved substances: ions, dissolved gases, hormones, plasma proteins, and waste products. Carry about 23% of the bloods total carbon dioxide. Shaped like biconcave disks and have great flexibility. Erythropoietin (epo, produced by kidney cells) stimulates the red bone marrow to produce more rbcs. Removes wastes, toxins, and damaged and abnormal cells. Can leave the circulatory system and move to the site of infection or tissue damage. Two groups are based on presence or absence of granules in cytoplasm. Engulf microbes by phagocytosis, thus curbing spread of infection. Release histamine, which attracts other white blood cells and causes the blood vessels to dilate. Also play a role in some allergic reactions. Develop into macrophages, phagocytic cells that engulf invading microbes, dead cells, and cellular debris. Named by the antigen (protein) found on the surface of rbcs.
