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Brain in MRI - Essay Example

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Brain in MRI Question 1: Review the relevant properties of blood and the changing MRI appearance of hemorrhage in the brain over time Blood is a liquid body tissue made up of different types of formed cells that are suspended in an aqueous complex body fluid known as the plasma, which contains various spectrums of organic molecules…
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Brain in MRI

Download file to see previous pages... The White Cells carry out important functions that entail fighting diseases. They are however relatively fewer in number compared to the Red Cells. Platelets, on the other hand, are numerous in number but they are smaller in size. The small size makes platelets to be considered unimportant contributors to blood flow. Red Cells contain a very flexible membrane enclosing a concentrated solution known as hemoglobin. The Red Cells play a huge role of determining various mechanical properties of blood. Properties of Red Blood Cells make up blood properties since about 95% of blood cells are the red blood cells. A red blood cell is a disc shaped element that is bounded by a membranous tissue made up of proteins, lipids and steroid substances. The most important component of the red blood cell is the hemoglobin, which plays the role of transporting oxygen to various body tissues. Visco-elastic properties of blood have been investigated by various researchers and this was achieved by measuring significant vitro conditions in transient and periodic blood flows. These flows are important in determining properties of blood since blood acts as a shear thinning non- Newtonian fluid and also exhibit thixotropy and visco-elasticity properties (Pedrizzetti and Perktold, 2004 p 54). Blood tissue is identified as a CT that contains a liquid matrix and it plays three major roles in the body system that include transportation of carbon dioxide, oxygen, nutrients, wastes, hormones and heat as well as regulation of the body temperature, pH and content of water in body cells (Mazumdar, 1992 p 34). Blood tissue protects against loss of excessive blood by facilitating blood clotting. It also protects the body against toxins and foreign microbes through the activity of specialized plasma proteins and phagocytic white blood cells. Blood is a free flowing liquid but it is more viscous and denser than water. The red color of blood is imparted by hemoglobin. When hemoglobin gets saturated with oxygen (oxyhemoglobin), it brightens the color of blood but when oxygen is removed (deoxyhemoglobin), the color of blood darkens. This is the reason why partially deoxygenated blood that comes from a vein tends to be darker compared to oxygenated blood that comes from an artery. Red blood cells constitute approximately 45% of the total blood volume. The white blood cells and platelets are smaller in number in the blood as they constitute less than one percent of the total blood cells. Plasma is the fluid portion of the blood and it is sticky and yellowish in color. These components make contributions to the properties of blood and the functions it plays in the body system. Within the body, blood is always a fluid and has turbulent flow that ensures white blood cells, red blood cells, plasma and all blood components are homogenously mixed. When blood is lost from the body through bleeding, physiochemical changes will occur as a result of blood properties causing blood to clot. Blood clotting will prevent excessive loss of blood from the body. The blood clot contains components of microscopic strands of fibrin which is a blood protein. Blood clot prevents excessive blood loss by forming a gel in which blood cells will be entrapped. When the blood clot contracts, it will release an incoagulable fluid known as serum (Geyer and Gomez, 2008 p 178). An anticoagulant can be administered to the blood to maintain its fluid state as well as prevent formation of ...Download file to see next pagesRead More
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Brain MRI
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