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12) List the 3 ways your body protects from infections.


13) What organ acts as a boundary between germs and your body?
A) thymus
B) heart
C) liver
D) skin


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 helpful 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
False


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

Correct Answers Will Be Marked As Brainlest

23) Neutorphils are attracted to foreign material, inflammation and bacteria.
True
False

Respuesta :

therezayadao
12.1 The acid in the stomach destroys microbes. 
12.2 The skin prevents microbes from getting into the body.
12.3 Sticky mucus in the lungs nets microbes, and then cilia span it out of the lungs
13. D. Skin
14. False - Mucos prevents microbes in certain organs
15. False - It is a colorless fluid. 
16. A. Bacteria
17. B1
8. False -  Thymus in the anterior part of the chest directly behind the sternum between the lungs
19. C. Red blood cells
20. False - Bone marrow produces the known blood cells
21. True
22. False - It starts in the bone marrow. 
23. True
12) 1) Skin and mucous membranes 
      2) White blood cells     
      3)The immune system and blood cells

13)The primary boundary is your skin, but almost every organ has some defense against germ infection.

14) false

15) true

16) rid the body of toxins, waste and other unwanted materials which you can say is dirt

17) A lymph node may swell in response to an infection somewhere in your body.

18) true

19) c.red blood cells

20) false

21) true

22) true

23) true





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