1 - By which mechanism do most toxicants cross cell membranes? a)Phagocytosis b)

Question

1 - By which mechanism do most toxicants cross cell membranes?

a)Phagocytosis   b)Membrane channels   c)Passive diffusion   d)Active transport

2 - Inhaled dust particles > 10 µm in diameter:

a)Often penetrate to the alveoli b)Are filtered out in the ET region   c)Are filtered out in the TB region   d)Are typically more toxic than PM2.5

3 - Wet skin is ______ vulnerable to penetration by aqueous toxins than dry skin.

a)More   b)Less   c)Equally

4 - Where does the exchange of carbon dioxide and oxygen take place in the body?

a)Pharynx   b)Bronchus   c)Bronchioles   d)Alveoli

Explanation / Answer

1.c=passive diffusion

4.d=Alveoli

3.b=less

2.a=Often penetrate to the Alveoli

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