Heart and Circulation I Text I © The McGraw-Hill. Older erythrocytes are removed from the circulation by phagocytic cells in the liver, spleen, and bone marrow. 2. in chemistry, a simple substance that cannot be decomposed by ordinary chemical means; elements are the basic components of which all matter is composed. The extracellular matrix, called plasma, makes blood unique among connective tissues because it is fluid. Start studying Chapter 17: Blood - Formed Elements: Platelets. These are found floating in the blood. The formed elements of the blood are illustrated in figure 13.3, and their characteristics are summarized in table 13.2. The formed elements are cells, cell remnants, and cell fragments in the blood. As the band cells mature, their nuclei become lobulated, with two to five lobes connected by thin strands. about 10% of the formed elements are red blood cells. They are highly flexible (as they must bend and twist as they pass through … a) Platelets b) Erythrocytes c) T lymphocytes d) Monocytes e) Basophils Answer: b Difficulty: Medium Study Objective 1: SO 19.2 Explain the origin of blood cells. Describe the composition of blood (plasma & formed elements) 4.1.1.1. Red Cells (erythrocytes)- their major function is to carry oxygen from the lungs to the tissues. Oxygen combines with iron atoms of hemoglobin molecules and the substance transported is oxyhemoglobin. Have been called the body's first line of defense against invading bacteria-phagocytize and destroy bacteria. An abnormal increase in erythrocytes, for example, is termed polycythemia and is indicative of several dysfunctions. Name the organ that synthesizes nearly all the plasma proteins. Platelets, or thrombocytes, are the smallest of the formed elements and are actually fragments of large cells called megakary-ocytes, which are found in bone marrow. In pernicious anemia there is an inadequate amount of vitamin B12, which is needed for red blood cell production. lymphocyte red blood cell platelet white blood cell all the above are formed elements… ■ Figure 13.3 The blood cells and platelets. White blood cells are almost invisible under the microscope unless they are stained; therefore, they are classified according to their staining properties. tract. Platelets. Your plasma is a fluid made up of proteins and salts. They release histamine, heparin and other substances when activated by T-lymphocytes. Jump to navigation Jump to search. Test Prep. 1. Erythrocytes are tiny biconcave disks, thin in the middle and thicker around the periphery. As previously mentioned, an abnormally low red blood cell count is termed anemia. A low white blood cell count, called leukopenia, may be due to a variety of factors; low numbers of lymphocytes, for example, may result from poor nutrition or from whole-body irradiation treatment for cancer. The platelet count per cubic millimeter of blood ranges from 130,000 to 400,000, but this count can vary greatly under different physiological conditions. This preview shows page 11 - 16 out of 16 pages. What is measured by hematocrit? flattened shape allows O 2 and CO 2 to diffuse quickly through the membrane ejects nucleus in immature stages ejects organelles in immature stages lasts only 3 – 4 months before it begins to break … The formed elements of the blood comprises of three components: 1. element [el´ĕ-ment] 1. any of the primary parts or constituents of a thing. These are enucleated (without a Platelets nucleus), bounded by a membrane and contain a few organelles. Counteracts affects of the basophils and mast cells. This leaves the body unprotected against invasion by bacteria that are residing on the mucous membranes of the mouth, resp. Each erythrocyte contains approximately 280 million hemoglobin molecules, which give blood its red color. Definition of formed elements of blood in the Medical Dictionary by The Free Dictionary the solid fraction of the blood, consisting of erythrocytes, leukocytes, and thrombocytes. Formed Elements consist of Erythrocytes (red blood cells that function in oxygen transport), Leukocytes (white blood cells that function in immunity), and Platelets (cell fragments that function in blood clotting). 1. (This is why the term formed elements is used instead of blood cells to describe erythro-cytes, leukocytes, and platelets.) 3 RBCs and Hemoglobin How many RBCs in 1 mm3 of blood… Their life span is about 5-10 days. They can be separated from blood plasma using centrifugal force. Those leukocytes that have granules in their cytoplasm are called granular leukocytes; those without clearly visible granules are called agranular (or nongranular) leukocytes. 1) Red blood Cells (erythrocytes) - 99.9%. Distinguish whole blood, plasma, and serum. In the absence of intrinsic factor, the vitamin B|2 obtained in the diet cannot be absorbed by intestinal cells. What makes your blood different from someone else’s is your unique combination of protein … I can't really remember anything else. There are two types of agranular leukocytes: lymphocytes and monocytes. The formed elements constitute up to 40 percent of the volume of the blood … As seen here, they are clinging to a hypodermic needle. The same volume of blood, by contrast, contains only 5,000 to 9,000 leukocytes. Erythrocytes. For example, blood transports hormones from endocrine organs to their target organs and tissues. Or is it the plasma proteins and/or other solutes that make up blood … The movement of leukocytes through capillary walls is referred to as diapedesis or extravasation. 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