Toxicology and Human Health

Carcinogens are substances that cause

• A sensitized reaction

• Out of control Cell growth

• Birth defects

• Immune Response

• Carcinogens can cause all of these reactions

Tags

NGSS.HS-LS3-2

Among the most important characteristics of chemicals in determining their environmental risks is/are

• Solubility

• Reactivity

• Persistence

• Toxicity

• All of these

Endocrine Disruptors

• Disrupt nerve cells

• Alter genetic material

• Repress the immune system

• Disrupt normal hormone functions

• Cause abnormalities in nervous tissue during embryonic growth

This will kill 50% of the population.

• LD50

• ED50

Heart disease is the #1 disease burden in 2020

• True

• False

Infectious diseases could be eliminated by which of the following?

• Better Nutrition

• Cleaner Water

• More sanitation

• All of these

Tags

NGSS.HS-LS2-7

The amount of a potentially harmful substance an individual ingests, inhales, or absorbs through the skin.

• dose
• LD50
• median lethal dose
• dose-response curve

Amount of a toxic material per unit of body weight of test animals that kills half the test population in a certain time

• risk assessment
• risk management
• LD50
• LD60

Chemicals that can harm the human nervous system

• cytotoxins
• necrotoxin
• hemotoxins
• neurotoxins

Which statement correctly explains how resistance to penicillin appeared after a few years of its widespread use to fight bacterial infection? 

• in order to survive exposure to penicillin, bacteria developed a resistance to the drug 
• a few bacteria became resistant to penicillin, and through sexual reproduction , most bacteria acquired the resistance
• penicillin never really successfully wiped out populations of bacteria, scientist did not use proper controls in their studies
• some bacteria were resistant to penicillin and their population spread rapidly, without competition from bacteria that were killed by penicillin