What is the Immune System?
Without it, we would all be forced to live in sterile environments, never touching each other, never feeling a spring breeze, never tasting rain. The immune system is that complex operation within our bodies that keeps us healthy and disease-free.
Few systems in nature are as complicated as the human immune system. It exists apart from, and works in concert with, every other system in the body. When it works, people stay healthy. When it malfunctions, terrible things happen.
The main component of the immune system is the lymphatic system. Small organs called lymph nodes help carry lymph fluid throughout the body. These nodes are located most prominently in the throat, armpit and groin. Lymph fluid contains lymphocytes and other white blood cells and circulates throughout the body.
The white blood cells are the main fighting soldiers in the body’s immune system. They destroy foreign or diseased cells in an effort to clear them from the body. This is why a raised white blood cell count is often an indication of infection. The worse the infection, the more white blood cells the body sends out to fight it.
White and red blood cells are produced in the spongy tissue called bone marrow. This substance, rich in nutrients, is crucial for a properly functioning immune system. Leukemia, the cancer of the bone marrow, causes greatly increased production of abnormal white blood cells and allows immature red blood cells to be released into the body. Other features, such as the lowly nose hair and mucus lining in the lungs, help trap bacteria before it gets into the bloodstream to cause an infection.
B cells and T cells are the main kinds of lymphocytes that attack foreign cells. B cells produce antibodies tailored to different cells at the command of the T cells, the regulators of the body’s immune response. T cells also destroy diseased cells.
Many diseases that plague mankind are a result of insufficient immunity or inappropriate immune response. A cold, for instance, is caused by a virus. The body doesn’t recognize some viruses as being harmful, so the T cell response is, “Pass, friend,” and the sneezing begins.
Allergies are examples of inappropriate immune response. The body is hyper-vigilant, seeing that evil pollen as a dangerous invader instead of a harmless yellow powder. Other diseases, such as diabetes and AIDS, suppress the immune system, reducing the body’s ability to fight infection.
Vaccines are vital in helping the body fend off certain diseases. The body is injected with a weakened or dead form of the virus or bacteria and produces the appropriate antibodies, giving complete protection against the full-strength form of the disease. This is the reason such disorders as diphtheria, mumps, tetanus and pertussis are so rarely seen today. Children have been vaccinated against them, and the immune system is on the alert. Vaccines have also been instrumental in eradicating plagues such as smallpox and polio.
Antibiotics help the body fight disease as well, but doctors are more cautious about prescribing the broad-spectrum variety, since certain bacteria are starting to show resistance to them. The next time you hug a loved one or smell a rose, thank your immune system. Although they can be used to fight infection, many medicines and drugs can weaken the body’s defense system. A doctor should always be consulted before taking any medication. Similarly, recreational drugs do much to harm the body’s defense system and should be avoided.
A great way of combating infection and illness is to take regular exercise. Exercising for at least 20 minutes a day, three times a week, can help keep the immune system healthy. Exercise also boosts the circulation system and reduces the risk of certain diseases. Exercise does not have to be a workout in the gym. Any type of exercise that gets the body sweating, flushing out harmful toxins, will count.
One of the major threats to the immune system is smoking. Many smokers find themselves with constant colds and viral infections. Smoking seriously harms and weakens the immune system. It is also widely known to be a contributory factor in a wealth of other diseases and illnesses.
The type of food that you eat also contributes to the health of your immune system. Eating plenty of fresh fruit and vegetables every day is a must to keep the body in top shape. Eating fast food only slows the body’s metabolism and contributes to weight gain. Any foods that are rich in vitamins and minerals can help keep the immune system healthy. Older people and pregnant women will especially benefit from eating foods that are rich in essential nutrients.
Cutting down on drinks with a high caffeine content is also a good idea. Drinking plenty of water helps flush harmful toxins from the body. Fresh fruit juices also provide vitamins, and there are also plenty of herbal teas that can be a great substitute for regular tea and coffee.
A big factor in keeping the immune system healthy is the amount of quality sleep that you achieve each night. During the sleep cycles, the body repairs itself in order to remain fighting fit. Sleep is also a great stress reducer. When the body is stressed, the immune system is weakened. Different people need varying amounts of sleep, but obtaining eight hours per night should be enough to keep the body healthy.