chapter 23 microbial diseases of the digestive system Flashcards


Posted On Feb 18 2015 by

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Although the clone cells only live a few days, their antibodies remain and circulate in the blood and lymph, gradually decreasing in number. Antibodies do not directly kill bacteria, but mark them for destruction. When antibodies bind to viruses they can prevent the viruses from infecting cells. When antibodies bind to toxins they can neutralize the toxin (why we get immunized against the tetanus toxin).

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The bacteria produces viral antigens which are then implanted to stimulate the immune system. Bacteria are prokaryotic (before nucleus) cells that we see usually as bacilli (rods) or cocci (spheres). While they are the major cause of many diseases both fatal and mild, bacteria are also our friends and can be of great service to us.

This is a difficult task, since pathogens range from viruses to parasitic worms and must be detected with absolute specificity as they are “hidden” amongst normal cells and tissues. Pathogens are also constantly changing themselves to avoid detection and successfully infect and destroy their hosts.

Humoral immunity works best fighting against target viruses, bacteria, and foreign molecules that are soluble in blood and lymph before the bacteria or viruses have entered into cells (extracellular bacteria and extracellular viruses). Complement is activated by antigen-antibody complexes and causes holes to form in the plasma membrane of foreign microbes or cells (lysis). The complement system is considered a nonspecific defense, but it can be activated against specific microbes that have been marked with antibodies.

In addition, Brunner’s gland in duodenum secretes bicarbonate, which is also an alkaline. Lastly, pancreas secretes an alkaline juice that would also protect the duodenum from the gastric juices. a lymph vessel that carries a liquid fluid called lymph. Vitamins A, D, E and K can only move with packaged fats in to the lacteal. The stomach pummels the food with muscular walls produces the protease enzyme pepsin.

Another example is the microflora that is in the vagina that helps maintain an acidic pH, which discourages the growth of infectious organisms. These are examples of our immune system’s first line of defense.

Poor access to health care and the existence of coexisting infections such as tuberculosis also may predispose people to faster disease progression. The infected person’s genetic inheritance plays an important role and some people are resistant to certain strains of HIV. The immune system is a very complex and highly developed system, yet it has a very simple mission, seek and destroy invaders. When the immune system does not function properly it leaves the body open for attacks from an array of diseases.

Each compartment contains tissue known as white pulp and red pulp. The white pulp contains lymphocytes and the red pulp acts in blood filtration. When blood enters the spleen and flows through the sinuses for filtration, lymphocytes react to pathogens , macrophages engulf debris, and also remove old, worn out red blood cells.

Macrophages are the primary scavengers within tissues. Macrophages also remove larger particles, such as old RBC and dead neutrophils. Macrophages play an important role in the development of acquired immunity. After they ingest and digest molecular or cellular antigens, fragments of processed antigen are inserted into the macrophage membrane as part of surface protein complexes. Lymph originates as blood plasma that leaks from the capillaries of the circulatory system, becoming interstitial fluid, filling the space between individual cells of tissue.

Diarrhea is a major indicator of most intestinal bacterial infections. The most common forms of intestinal bacterial infection include salmonella, shigella, E.coli, and Colostrums all of which cause inflammation of the stomach and intestines. Symptoms of the intestinal bacterial infenction vary depending on bacteria. Usually the symptoms are cramps and pain, bloody feces, loss of appetite, nausea and sometime vomitting and fever. a.) – simple diffusion – A process where a substance passes through a membrane without the aid of an intermediary such as integral membrane protein.

Two major classes of regulatory T cells have been described, including the naturally occurring Treg cells and the adaptive Treg cells. Type 1 hypersensitivity is an allergic reaction provoked by reexposure to a specific antigen. Exposure may be by ingestion, inhalation, injection, or direct contact. The reaction is mediated by IgE antibodies and produced by the immediate release of histamine, tryptase, arachidonate and derivatives by basophils and mast cells.

pylori.A) 47% of the control group has been infected with H. pylori. Calculate the percentage of the group with stomach cancer that had been infected. B) Using all the data, evaluate the hypothesis that H.

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Injections containing antibodies are another. Sometimes travelers going abroad may be injected with gamma globulin, but this passive immunity last only about three months. Passive immunizations are used to protect people who have been exposed to infections or toxins, like snake venom or tetanus. Active immunity can occur naturally, when a pathogen invades the body, or artificially, like when we are given vaccinations containing disabled or killed pathogens. The body does require prior exposure to an antigen to develop an active immunity.

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