The Human Immune System Essay

The human immune system creates a series of responses in the body to defend the body. If a foreign organism, such as a virus or a cold invades your body, it recognizes these foreign organisms, and, in turn, attacks them to get rid of them. One can think of the immune system as an army of many cells which have set up their own bastion in the human body. They have only one job: To defend. The immune system’s cells are various kinds of white blood cells. The human body typically creates about 1000 million white blood cells on a daily basis. A group of these cells, macrophages, establish a patrol of sorts throughout the body killing germs as soon as they enter the body. However, sometimes an infection can cause the macrophages to succumb to it. The body begins to fight back with stronger T- and B-cells.

The immune system is an important and complex part of the human body, guarding it against bacteria

The body encounters billions of germs every day and the immune system with all its intricacies fights off these pathogens. The defense mechanism of the human body is complex and fascinating, working all around the clock with its work largely unnoticeable.

Foreign particles such as bacteria, viruses, toxins and parasites, enter the human body in ways people would never guess. For example when a rusty nail pokes a hole in your foot, the first part of the immune system is damage, the skin. The bacteria enters your wound. Bacteria starts using up the body’s supplies in order to reproduce. At first they go without being detected but when a certain number of bacteria is present, they damage the body by changing their surroundings. The immune system’s job is to work as quickly as possible, in order to stop this.

A primary role of the immune system is fighting off harmful bacteria and viruses. However, recent studies have revealed additional roles of immune cells in other important host functions, such as controlling body weight.

    The human immune system is constantly undergoing changes because of the pathogens that are trying to invade the body. Once the pathogens cross your initial barriers your body has a second defence that comes into play. This is your immune system which is composed of your innate and adaptive immunity. Innate immunity has two line of defense, the first line starting with the skin and mucosal membranes, these create barrier to try and fight off pathogens entering the body. The second line is an internal response consisting of many types of phagocytes, and  chemicals and physiological processes which fight against pathogens (pg 854 Textbook). Meanwhile adaptive immunity is a response that has multiple cells that work to fight off specific pathogens. These cells start off as simple T-lymphocytes and B-lymphocytes. T-lymphocytes go through a process when identifying a pathogen and eventually form cytotoxic T- lymphocytes and helper T-lymphocytes. When B- lymphocytes cross a pathogen they form into plasma cells in order to release antibodies and target (textbook pg 864). These two immunities play a big role in providing a healthy defense after vaccination is injected to allow the body to be immuned to

The immune system includes innate and adaptive immune responses. The innate immune system acts as the first line of defense to rapidly and nonspecifically respond to foreign pathogens. The adaptive or acquired immune system, however, responds to pathogens to create a long-term immunological memory. As a result, the adaptive immune system can initiate a heightened response to subsequent exposures to the same pathogen and provide a protective immunity. Leukocytes can be classified as neutrophils, eosinophils, basophils and mast cells, monocytes/macrophages, and

The immune system is a defence mechanism inbuilt in all living organisms comprised of specific biological processes and structures. Its purpose is to protect against disease using the networks of cells, tissues and organs that work cohesively for protection. In order to function correctly, the immune system must be able to detect and distinguish an expansive variety of pathogens that derive from harmful viruses, bacteria, protozoans, parasites etc. The immune system can be divided into subsystems including the adaptive immune system and the innate immune system, as well as act as part of a whole of the organisms’ body,

he immune system is a highly sophisticated and organised structure with multiple varying defence mechanisms designed to attack and fully destroy any non-self cell. The body eliminates these pathogens in order to allow for the optimal metabolic function of an organism, which is improved in the absence of disease. However, errors may occur, resulting in the system’s inability to successfully distinguish between the pathogen and the body’s own healthy cells. As a consequence of this misinterpretation, antibodies attack and terminate its own body cells. This random attack on healthy self cells is known as autoimmunity, the trigger of which is frequently unknown.

The immune system is a complex bodily system involving multiple organs, tissues and cells. What exactly is immunity? Immunity is the state of protection against infectious disease conferred either through an immune response generated by immunization or previous infection or by other non-immunological factors (Baxter, 2007, p. 552). Immunity can be broken into two major categories, innate and adaptive immunity. The innate and adaptive immunity both play a vital role when it comes to the immune systems function and health.

The body’s ability to contain, neutralize and kill foreign pathogens is a key attribute of the human immune system .Naturally, the immune system made up of organs such the bone marrow, Spleen, thymus, tonsils and lymph nodes in addition to cells like T cells cells, Natural killer cells, Macrophages, Polymorph nuclear (PMN) Leukocytes and dendritic cells should automatically coordinated and clear off pathogens from the body.

The job of the immune system is to keep “foreign” invaders out of the body, or if one gets in, to seek it out and kill it. These foreign invaders are called pathogens, which are tiny organisms that can cause an infection in the body. Pathogens

Exactly the same holds true with the human body, a system that is so basic yet at once intricate in its operation and processes. Without our body 'ss built-in system of defense against bacteria, infections, germs, viruses and other foreign bodies, our bodily organs and essential bodily functions could very well be just time bombs waiting to explode. However thanks to our immune system, our body 's critical line of defense against diseases, infections and other health conditions, we are guarded against intruders that jeopardize the daily functioning of our bodily system.

The immune system is the combination of defense responses against the disease-producing organism, called pathogens, which play a fundamental role in body 's abilities to maintain its state of homeostasis. The resistance against the pathogens can be fighted thanks to two collaborative systems: nonspecific and specific resistance. Nonspecific resistance consists of defense mechanism that provides a protection response to a wide range scale of invaders. This includes nonspecific, mechanical barriers and defenses. Whereas, specific resistance focuses on particular types of pathogens by providing immune responses to the body.

Human’s body is constantly under attack by: bacteria, viruses and many other microorganisms, these are called pathogens. Our body is a rich source of water and nutrients that these pathogens need to survive, it is a perfect environment for them to live and develop. Nevertheless, human’s body has its own way to protect itself from these invaders, therefore most of the time we remain healthy. Immune system is a system of many biological structures and processes within an organism that provides a defence against disease. There are three major lines of our defence against pathogens. The first is to prevent their entry by defences of the skin and mucous membranes in the respiratory, digestive and urogenital tracts. If this fails, two internal defences takes over: an initial non-specific inflammatory response to injury, or if this unsuccessful, is followed by specific immune response. Two major divisions of the immune response: non-specific and specific.