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How the Body Works : The Immune Mechanism By dizzo95 How the Body Works The Immune Mechanism The immune mechanism is designed to protect the body against attack from invading microorganisms and foreign, potentially harmful molecules. There are four types of immune mechanisms. The nature of the invading antigen determines which type of mechanism is brought into action. Certain antigens promote an exaggerated response, called a hypersensitive reaction, or an allergy., which may be harmful to the body tissues. A type I reaction is an allergic response to foreign substances, usually proteins, entering the body. It is an immediate reaction which occurs within minutes or hours of the antigen entering the body. The diagram follows the events that occur in a type I response. The antigens enter the body and stimulate B-lymphocytes to produce antibodies. The antibodies then adhere to mast cells in the vessel wall. They neutralize the antigens and the mast cells release a chemical which causes, for example, the streaming eyes and the sneezing symptomatic of hay fever. A type II reaction is initiated by antigens which are part of, or closely associated with, a tissue cell. The diagram shows antigens entering the bloodstream and invoking the production of antibodies. The antibodies destroy the antigens, but they may also cause, for example, a cross reaction with blood cells which can lead to cell damage. An example of this type of reaction is a mismatched blood transfusion, in which antibodies are formed against the donor red cells, which leads to their destruction. A type III reaction is an immediate reaction occurring within a few hours of a small antigenic stimulation. The diagram shows antigens entering blood already filled with antibodies, formed during a previous exposure to these antigens. The antibodies form a complex with the antigen and a blood protein called complement. The complex so formed may damage tissue, such as the glomeruli of the kidneys, by blocking up the capillaries. The final type of reaction, the type IV reaction, is a delayed immune response which occurs more than twenty-four hours after the initial contact with the antigen. The antigens enter the bloodstream, where they stimulate T-lymphocytes to produce antibodies which remain attached to the cell wall. The antibodies then destroy the antigens. Once the T-lymphocytes have been sensitized by the antigen, they can produce antibodies and confer immunity. This is the basis of immunization against tuberculosis. Tags: immune, mechanism, the 1 Downloads - Last from: http://downthisvideo.com/ (Your Blog here!) |
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Mechanism (Steve Kilbey) (Freaky Conclusions) By artman8764 From the exceptional album, Freaky Conclusions, Steve Kilbey of The Church (The Church Band) performs Mechanism. Videography by DD. Tags: artman, artman8764, freaky conclusions, kilbey, kilbey mechanism videos, kilbey videos, mechanism, mechanism videos, psych..., steve kilbey, steve kilbey videos 1 Downloads - Last from: http://downthisvideo.com/ (Your Blog here!) |
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How the HIV virus enters the cell By brockchristophe More hiv e-learning animations on: www.tibotec-hiv.com Tags: action, aids, drugs, haart, hiv, inhibitors, learning, mechanism, treatment, viral, virus 1 Downloads - Last from: http://downthisvideo.com/ (Your Blog here!) |
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Balancing Robot By vahidyou2004 This is a very simple robot that uses a simple switch as a sensor and stands on only two wheels with inverted pendulum mechanism. When the robot is going to fall the motor starts and moves the robot to the direction it is going to fall, so the motor torque about the center of gravity that is higher than the motor makes the robot balanced. You can find the tutorial of making this robot at http://mcop.netfirms.com/balrobo.html You can also find the tutorial of making this robot at http://www.instructables.com/id/balan... Tags: balancing, inverted, mechanism, pendulum, robot, simple, stand, two, wheels 1 Downloads - Last from: (Your Blog here!) |
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Gau-16 - Firing Mechanism Animation By sweeebooo Animation of the 50 caliber gau-16 machine gun. Tags: .50, 50, animation, cal, caliber, fifty, firing, gau16, gun, machine, mechanism 1 Downloads - Last from: http://downthisvideo.com/ (Your Blog here!) |
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Very Cool 3D Medical Animation By nucleusanimation http://www.nucleusinc.com Nucleus Medical Art's 2007 animation demo reel shows surgery, anatomy, mechanism of action (MOA), and physiology produced for medical devices, pharmaceutical companies, biotechnology, marketing agencies, lawyers, and more. Online at http://www.nucleusinc.com/youtube Tags: 3d, action, animation, art, biology, biotechnology, cell, genetics, illustration, mechanism, medical, moa, nucleus, pharma, scientific 1 Downloads - Last from: http://downthisvideo.com/ (Your Blog here!) |
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Mechanisms Of Evolution (Part 2 of 2) By cassiopeiaproject A short easily understood tale of how evolution really works. Tags: chromosome, darwin, deletion, dna, duplication, evolution, fusion, genome, mechanics, mechanism, natural, select, species 1 Downloads - Last from: (Your Blog here!) |
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Mechanisms Of Evolution (Part 1 of 2) By cassiopeiaproject a short easily understood tale of how evolution really works. Tags: chromosome, darwin, deletion, dna, duplication, evolution, fusion, genome, mechanics, mechanism, natural, select, species 1 Downloads - Last from: (Your Blog here!) |
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