Nerve Cells (Neurons) Are Connected by

Q3: The amount of a substance which is

Q4: Carcinogens are chemicals that can cause<br>A)birth defects<br>B)mutations<br>C)cancer<br>D)hair

Q5: Medications and toxins alike can enter the

Q6: The toxin arsenic occurs naturally in the

Q7: PCBs, or polychlorinated biphenyls,<br>A)are used today extensively

Q9: The insecticides parathion and malathion interfere with

Q10: Neurotoxins interfere with the<br>A)Citric Acid cycle<br>B)Krebs cycle<br>C)Acetylcholine

Q11: The insecticide DDT (p-dichlorodiphenyltrichloroethane) is<br>A)highly toxic to

Q12: Nitrogen dioxide (NO₂) is<br>A)very dangerous to humans,

Q13: British Anti-Lewisite (BAL) is able to react