The answer is 2. Antibodies function, in general, by directly destroying antigens, starting complement or by initiating inflammation to halt the proliferation of the infectious agent.

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The answer is 4. There are different types of cells, each of them with different functions or roles in our body in order to maintain homeostasis. These cells are produced also by different organs in the body which are based depending on the function.

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The answer is 4. Antibodies act on pathogens once it becomes present in our body. This is part of the immune system and performs a big task in protecting the body from being harmed.

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The answer is 1. Since the role of the immune system is to prevent or fight pathogens such as bacteria and virus that invade our body, having a transplant would be difficult because the immune system would register is as a foreign body and will therefor attack it.

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The answer is 1. Antibodies act on pathogens once it becomes present in our body. This is part of the immune system and performs a big task in protecting the body from being harmed.

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The answer is 2. A vaccine is made up of either dead or weakened pathogen. This pathogen is then injected in our body wherein our body recognizes this pathogen so that in the future, when this type of pathogen attacks our body, our immune system would be able to know how to fight and eliminate it.

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The answer is 2. White blood cells and antibodies are both parts of the immune system wherein they both function to protect our body from attacking once inside or preventing our body from being penetrated.

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The answer is 3. WBC is a part of the immune response wherein it initiates an immune reaction when there is a pathogen. This immune response has memory and do not cause harm because when the same pathogen enters the body again, the immune system will act upon it easily like before.

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The answer is 2. Toxins come from pathogens and is the one responsible for the harmful effects. Toxins are formed by pathogens and create different symptoms depending on their composition.

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The answer is 2. Cancer usually spread and proliferate due to uncontrolled cell division wherein cancer cells continue to divide without signals that prevent these cancer cells to divide.

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The answer is 1. Immunity is the third line of defense and it is the ability to resist or withstand against an infectious agent specifically their toxic materials or by-products.

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For inherited disorders, some diseases are glucose 6 phosphate dehydrogenase which is a disease of the newborn that lacks the glucose 6 phosphate dehydrogenase enzyme which helps breakdown glucose. Another one is toxic substances, lead poisoning is usually from the earth’s crust which may have a great effect on the health of a person especially in children.

An example of this is called autoimmune disease. An example of an autoimmune disease is grave’s disease. Graves is a disease wherein the thyroid gland produces too much thyroid hormone and then in return, causes hyperthyroidism.

A vaccine contains an antigen that triggers a primary immune response to counter exposure to an infectious agent or pathogen. A specific reason why students require vaccinations is because of the risk of acquiring pathogens while in school and the idea of herd immunity wherein when one person is not immunized, he or she will be protected by those immunized.

The major problem is that donated tissues maybe identified as foreign bodies by the immune system. Then this foreign tissue is acted upon by the immune system destroying the donated tissues.

This problem may occur because of the fact that the immune system identifies the donated tissue as a foreign body.

If the tissues and organs produced by stem cells from the stem cells are used, the immune system will not consider it as a foreign body and will therefore generate its memory towards the new cells.