The immune system serves to protect and fight against pathogens and disease.
The first line of defense used in the immune system is physical barriers. The first physical barrier is the skin. The skin has sebum (oil) which is on the skin’s surface making it acidic and making many pathogens unable to grow on it. Sweat also contains special enzymes to attack bacteria, killing it, and making it unable to spread. The second physical barrier is Mucus Membranes which covers majority of internal body structures making it hard for pathogens to affect these systems. It also produces a thick fluid called mucus that traps pathogens before they start in infect. The second line of defense is when pathogens make it past the physical barriers causing your
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Hormones are chemical messengers produced by glands and are distributed through the body from the bloodstream to affect different parts of the body based on which hormone fits with which receptor and target cells. Hypothalamus is a part of the brain responsible for the direct control of the endocrine system through the Pituitary Gland. The Pituitary Gland is a small lump of tissue connected to the hypothalamus surrounded by blood vessels which carry the released hormones throughout the body. Another gland in the endocrine system is the Thyroid gland, this regulates your metabolism (ability to break down food) by releasing thyroid hormones into the bloodstream. The pituitary gland and the hypothalamus control the thyroid by watching its hormone levels. If the hormone levels drop the hypothalamus secretes a hormone which alerts the pituitary gland and informs it to produce thyroid stimulating hormones, which allows the thyroid to produce more hormones. The endocrine system uses feedback mechanisms in order to control …show more content…
It carries food, liquids, and saliva to the stomach from the mouth. The stomach is a muscular organ on the left side of the upper abdomen. After the esophagus delivers the foods and liquids, the stomach secretes acids and enzymes to digest the food then the stomach pumps the food and liquids into the intestines. The liver filters blood from the digestive tract and secretes bile that goes into the intestines after detoxifying chemicals and metabolizing drugs. The gallbladder is under the liver and stores and recycles excess Bile from the small intestine so it can be used again in digestion. Bile is a fluid that helps with digestion by breaking down fats into fatty acids which is then taken into the body by the digestive tract. The pancreas is a large gland that secretes digestive enzymes into the small intestines in order to complete chemical digestion. The small intestine is a long thin tube that contains many folds which help to digest food and absorb nutrients. The large intestine is a long thick tube that absorbs water and contains symbiotic bacteria that helps to break down wastes and extract nutrients. Poop in the large intestine leave through the anus. The villus is located inside of the small intestines, they increase the surface area of the small intestine and absorb
The immune system is made up of a network of cells, tissues, and organs that work together to protect the body, and it defends the body from “foreign invaders.” Immunity can be divided in two three different defenses, and these are defined as first, second and third lines of defense. The first line of defense for the immune system is the primary defense against pathogens entering the body from the surface in order to prevent the start of disease and infection. Some examples of the first line of defense is the skin, protecting the external boundaries of the body, and the mucous membranes, protecting the internal boundaries of the body. Although the skin and mucous membranes work on the internal and external boundaries, they both release chemicals
During digestion, the body breaks down food into smaller molecules that could then be used by the body’s cells and tissues in order to perform functions. This starts off in the mouth with the physical movements of chewing and the chemical breakdown by saliva. Enzymes in the stomach break food down further after traveling from the mouth through the esophagus. The food from here then moves into the small intestine, where pancreatic juices and enzymes dissolve proteins, carbohydrates, and fibers, and bile from the liver breaks down fats into these small molecules. Any portion of the fibers or food that were unable to be broken down are passed from the small intestine to the large intestine, which is where the digestive tract transitions into the excretory tract, then the colon and out of the rectum. Any liquids that have been stripped of their nutrients by the body proceed from the stomach to the kidneys. In the kidneys, sodium ions (Na+), uric acid, and urea are exchanged with water, which moves urinary bladder and is excreted through the
Most of the time nonspecific defenses keep pathogens from getting into the body. Sometimes one can break through and cause a disease. This is where the immune system comes into use.
The endocrine system is very dynamic and has ties to most, if not all of the other major systems of the body. It is responsible for production of hormones and the regulation of them as well. These hormones act as chemical messengers within the body. Through several differing mechanisms, they are able to trigger very specific responses in target cells or organs. This is what enables the endocrine system to guide growth, development, reproduction, and behavior, among many others as well.
The thyroid organ, though small, impacts every cell in the body by providing metabolism regulation (endocrine web). This butterfly-shaped, endocrine organ located at the neck, secretes hormones to control the body’s metabolism - or the way the body uses energy that help the body with energy, manage heat, and help organs such as the heart and brain function properly (thyroid.org). When not functioning properly, thyroid dysfunctions occur disrupting the three points of control: the hypothalamus in the brain, the pituitary gland, and the thyroid gland. Common thyroid disorders include Hashimoto’s, Graves’ disease, thyroid disorders like hypothyroidism and hyperthyroidism, and nodules or goiters (health line).
The function of the immune system is it helps play a vital part of our everyday lives. It helps protect our bodies where ever we go. Our immune systems help defend our bodies against germs and microorganisms. The immune system is made up of various special cells, tissues, organs and proteins. This special system does an amazing job of keeping our bodies healthy and in good shape from different diseases and infections.
The digestive system otherwise known as the gastrointestinal tract (GI tract) is a long tube which runs from the mouth to the anus. It operates to break down the food we eat from large macromolecules such as starch, proteins and fats, which can’t be easily absorbed, into readily absorbable molecules such as glucose, fatty acids and amino acids. Once broken down, these molecules can cross the cells lining the small intestine, enter into the circulatory system and be transported around the body finally being used for energy, growth and repair.
The thyroid gland is found in the front of the neck and produces two main hormones. The hormones are called thuroxine (T4) and Triiodothyronine (T3). Together these hormones regulate the body’s metabolism by increasing energy use in cells, regulate growth and development, help to maintain body temperature and aid in oxygen consumption. These two hormones are regulated by hormones produced by the hypothalamus and pituitary gland. The hypothalamus senses changes in body’s metabolic rate and releases a hormone known as thyropin-releasing hormone (TRH). This hormone then flows through connecting vessels to the pituitary gland which signals it to release another hormone. This hormone is known as thyroid-stimulating hormone (TSH). TSH then makes its way to the bloodstream until it reaches the thyroid where it is then signaled to activate T3 and T4 production [1]. This mechanism is controlled by a negative feedback loop meaning that when there is a sufficient amount of thyroid hormones in the blood stream, this will signal back to stop production of thyroid stimulating hormones. Complications occur when the thyroid hormones keep increasing even though there is already a sufficient amount of T3 and T4 in the blood stream. This process of over expression of thryroid hormones is known as hyperthyroidism. Hyperthyroidism is a general term that includes any disease that has a consequence of an overabundance of thyroid hormones. Hyperthyroidism is a general term but there are many variant diseases that are in the hyperthyroidism category. These diseases include diffuse toxic goiter, Basedow’s disease, thyrotoxicosis, Parry’s and Graves’ disease.
...ve eaten, to break down the food into a liquid mixture and to slowly empty that liquid mixture into the small intestine. Once the bolus has entered your stomach it begins to be broken down with the help of the strong muscles and gastric juices which are located in the walls of your stomach. The gastric juices are made up of hydrochloric acid, water, and mucus- and the main enzyme inside of your stomach is what is known as pepsin, which needs to be surrounded in an acidic setting in order to do its job, that is to break down protein. Once the bolus has been inside of your stomach for long enough it begins to form into a liquid called chyme, and what keeps the chyme from flowing back into our esophagus are ring shaped muscles known as sphincters located at the beginnings and ends of the stomach and they have the task of controlling the flow of solids and liquids.
This immunity is dependent upon our body to be exposed to a particular type of pathogen once before. After the exposure, our body’s immune system learns of a way to counteract the foreign substance. The immune system learns the most effective way to counter each antigen that enters and then retains that strategy until the same pathogen attacks on it again. It completely customizes its attack, adapts to new conditions and remembers the information. This why people are given shots of inactivated viruses. When these viruses enter the blood stream, the body thinks that they are harmful pathogens and then develops a way of counteracting to them. After battling these viruses, they remember their form of attack, so in case these same harmful viruses enter the blood stream again, they can deal with them quickly and efficiently. Lymphocytes (T and B cells are required for this immunity). The antibodies IgA are expressed in our body on the mucous surface of the gut. When foreign substances enter, the intestine, they kill those pathogens before they can even grow in the
As immunisers we need to have a thorough understanding of the immune system and the vaccine action. Immunity is the protection and ultimately the response that occurs when a person has been vaccination or has been affected with an infection and ultimately recovered. (Australian Academy of Science 2012; Brown & Edwards 2010). The immune system consists of millions of white blood cells, these contain the materials that initiate immune responses these being identified as antigens (Brown & Edwards 2010). Antigens exist on the surface of all of the body’s cells, and are unique to each individual that ensures the body is capable to recognize anything that is foreign (Black 2008; Brown & Edwards 2010). By being able to recognize and respond to antigens that are regarded foreign to the body and consequently they stimulate an immune response, the immune system is able to protect itself from harm (Australian Academy of Science 2012).
The immune system is a fascinating structure it defends the body against foreign invaders like bacteria, viruses and parasites. There are two primary forms that make up the immune system they are, innate and adaptive systems. Both the innate and adaptive system plays a large role in the immune system. The innate is the primary system to defend against foreign materials and the adaptive is the secondary system that responds to specific issues.
The skin has 3 main function. It has to regulate body temperature, remove waste (perspiration), and protect. The skin is made up of 3 layers. The epidermis is the outer thinner layer of the skin that is made up of dead and living cells. The dermis is the thicker middle layer of the skin that contains blood vessels and nerves. Sweat glands are found in the dermis, they secrete perspiration through ducts to pores on the skin’s surface. To avoid problems like warts, boils, moles, acne, and sunburn you can wash your body daily, wear sunscreen that is 15 or higher, and check your body often...
The digestive system is a very important system in the human body. It is a group of organs that work together to turn food into energy and nutrients in the entire body. The food that was chewed in a humans’ mouth now passes through a long tube that is inside of the body that is known as the alimentary canal. The alimentary canal is made of the oral cavity, pharynx, esophagus, stomach, small intestines, and large intestines. Those few things are not the only important accessories of the digestive system there is also the teeth, tongue, salivary glands, liver, gallbladder, and pancreas.
The large intestine 's main function is to transport food particles through the body and expel the indigestible parts at the other end, but it also collects waste from throughout the body. The typical brown colour of mammal waste is due to billirubin, a breakdown product of normal heme catabolism. The lower part of the large intestine also extracts any remaining usable water and then removes solid waste. At about 10 feet long in humans, it transports the wastes through the tubes to be excreted.