14) mucus plays no role in you immune system.
true
false

15) lymph is a colored liquid that bathes the cells with water and nutrients.
true
false

16) one job of the lymph system is to filter out
a) bacteria
b) dirt
c) protein
d) mucus

17) why are lymph nodes in determining you have an infection?
a) they discolor
b) they swell
c) bad odor
d) they move

18) the thymus lives in your chest, between your breast bone and your heart.
true
fals

19) a spleen filters blood looking for
a) white blood cells
b) foreign cells
c) red blood cells
d) bone marrow

20) bone marrow only produces red blood cells.
true
false

21) when an antibody binds to a toxin it is called an antitoxin.
true
false

22) all white blood cells start in the lungs as stem cells.
true
false

23) neutorphils are attracted to foreign material, inflammation and bacteria.
true
false

24) eosinophils seem focused on parasites in the skin and the lungs.
true
false

14) False.
The mucus in our bodies works as a prevention from letting germs and other unwanted foreign bodies in our system. It works more like a barrier. Whereas the immune system is composed by antibodies and blood cells which attack the problem, getting rid of it. 

15) False.
The lymph is a rather clearish liquid that bathes the cells in water and nutrients. Its purpose is to feed the cells of the food, water and oxygen they need in order to survive. Another use is to filter the fluids to find and eliminate bacteria that might have gotten in the system. 

16) A. Bacteria.
One of the jobs for which the lymph is important is that it filters the inter-cell fluids to reseach for eventual bacteria that might have entered, and eliminate it. It moves around our body through lymphatic channels and ducts, which contain the primary cells that compose the immune system.

17) B. They Swell.
Lymph nodes are small organs that contain the immune system cells which serve to attack unwanted and unrecognized bodies in our system. They can be found in various parts of our body, and when you get sick, they swell, they become infected and painful. 

18) True.
The Thymus is one of the main lymphoid organs of the immune system. It is indeed found between the heart and the breastbone (sternum). The thymus is what produces T-cells, which play a huge role in our immune system. The loss of the thymus may lead to immunodeficiency. 

19) C. Red Blood Cells.
The spleen is the biggest lymphoid organ in our body, situated in the upper left of the abdomen. It filters the blood, looking for old or damaged red blood cells, which are then broken down by white blood cells called macrophages. What remains of the broken-down red blood cells returns to the bone marrow and might be re-used. 

20) False.
There are two types of bone marrow: Red Bone Marrow (which is where the red blood cells are produced) and Yellow Bone Marrow (which produce fat, cartilage and bone). Both bone marrow can be found in the inner core of the bones in the form of a soft and gelatinous tissue. 

21) True.
When an antibody binds to a toxin is called an antitoxin (if the toxin comes in the form of venom, its called antivenin). This is referring to when an antibody binds to the outer core of a virus or bacteria, trying to stop its movement through the cell walls. 

22) False.
White blood cells' main function is to defend our body from infection. They are produced in the bone marrow. There are different types of white blood cells, all with a specific job: Neutrophils, Lymphocytes, Monocytes, Eosinophyls, and Basophyls.

23) True.
Neutrophils are the most numerous type of white blood cells that can be found in our body, taking a solid 55-70%. They are particularly interested in the elimination of bacteria, fungi, viruses, poison and cancer cells. They produce chemicals that attacks the infection or inflamation right at the source.

24) False.
Eosinophils are not focused on parasited in the skin and lungs. Although they do play a big role in the control mechanism for allergies and asthma. They can be found in the medulla and the thymus, in the gastrointestincal tract, ovary, uterus, spleen, and lymph nodes, but not in the lungs, skin, and esophagus. 

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