Understanding Disease Transmission and Hazards

The video discusses environmental hazards, categorizing them into physical, chemical, biological, and cultural types. It delves into chemical hazards, explaining neurotoxins, carcinogens, teratogens, endocrine disruptors, and allergens. The concept of dose-response curves is introduced to measure toxicity. Biological hazards, including pathogens like viruses and bacteria, are explored. The video highlights the link between habitat destruction and zoonotic diseases, emphasizing the role of biodiversity in mitigating disease spread.

Which of the following is NOT a category of environmental hazards?

• Physical

• Chemical

• Psychological

• Cultural

What type of chemical hazard is known to cause cancer?

• Neurotoxins

• Carcinogens

• Teratogens

• Allergens

Which chemical is an example of an endocrine disruptor?

• Arsenic

• Lead

• Mercury

• DDT

What does an LD50 test measure?

• The dose of a chemical that causes birth defects

• The dose of a chemical that is lethal to 50% of a population

• The dose of a chemical that is effective for 50% of a population

• The dose of a chemical that disrupts the endocrine system

Which of the following is a biological hazard?

• Earthquake

• Virus

• Pesticide

• Diet

How do viruses typically cause disease?

• By excreting toxins

• By hijacking cell machinery

• By acting as parasites

• By causing allergic reactions

Which disease is transmitted by mosquitoes and caused by a protozoan?

• Cholera

• Malaria

• SARS

• Tuberculosis

What is a zoonotic spillover?

• A chemical spill affecting wildlife

• A disease spreading through contaminated water

• A virus mutating to infect a new host

• A natural disaster affecting human habitats

How does habitat destruction contribute to the spread of zoonotic diseases?

• By improving sanitary conditions

• By increasing biodiversity

• By reducing human population density

• By increasing contact between humans and animals

What is the dilution effect in the context of disease spread?

• Lower population density leads to slower disease spread

• Higher biodiversity leads to lower infection rates

• Higher population density leads to faster disease spread

• Lower biodiversity leads to higher infection rates