Doncouse_Jeremy_Week1

Doncouse_Jeremy_Week1 - Running head: Chapter 17 1 Week 1...

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Running head: Chapter 17 1 Week 1 Written Assignment Jeremy Doncouse Mountain State University
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Running head: Chapter 17 2 Chapter 17 : Blood Overview: Blood Composition and Functions 1. Describe the composition and physical characteristics of whole blood. Explain why it is classified as a connective tissue. A healthy person has 4-6 liters of blood. Whole blood is composed of 55% plasma, less than 1% leukocytes, and 45% erythrocytes. Blood is a connective tissue because it contains the three elements of connective tissue: cells, ground substance and fibers. Blood Plasma 1. Discuss the composition and functions of plasma. Plasma is a yellowish sticky fluid. It is mostly water but contains nutrients, gases, hormones, wastes, ions, and proteins. Most plasma proteins are produced by the liver. Albumin is an important plasma protein because it 1) acts as a carrier for other molecules, 2) buffers the blood, and 3) is a major contributor to blood osmotic pressure. Sodium ions also contribute to osmotic pressure. Serum is plasma with the clotting proteins removed. Formed Elements 1. Describe the structure, function, and production of erythrocytes. Erythrocytes, known as rbcs, are biconcave disks, without nuclei, which contain large amounts of hemoglobin. They are the most numerous blood cells and have a lifespan of 120 days. Production of rbcs occurs in the bone marrow from a precursor cell called the hemocytoblast. , Produced by the kidney in response to hypoxia production is
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Running head: Chapter 17 3 stimulated by the hormone erythropoietin. Substances necessary for production of rbcs are iron and the Bcomplex vitamins B12 and folic acid. Intrinsic factor is necessary for vitamin B12 to be absorbed from the intestinal tract. 2. Describe the structure and function of platelets. Platelets, or thrombocytes, are actually cytoplasmic fragments from large cells
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This note was uploaded on 03/08/2011 for the course BIO 216 taught by Professor Amirafshar during the Spring '11 term at Mountain State.

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Doncouse_Jeremy_Week1 - Running head: Chapter 17 1 Week 1...

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