quiz 21

How many new chemicals are released into the environment each year?

1,000

Close to __________ of infectious diseases are transmitted through water.

75%

Organisms that transfer diseases to humans are ____________________.

?

The amount of a substance in the body is also called the __________________.

?

Pathogens that cause HIV and West Nile Virus have made a __________ from animals to human beings.

Cross-Species Transfer

Which of these harmful chemicals has been found to cause nerve damage and cancer?

DDT

__________________ caused by parasitic protists and transmitted to humans by bites from female mosquitoes.

Malaria

Which of these harmful chemicals was found to cause learning problems in children who were exposed to it in the womb, along with memory problems in adults?

PCB

Which of these diseases are NOT currently affecting millions of people worldwide?

Polio

Cases of salmonella and E.Coli poisoning have been attributed to _______________________.

antibiotic resistance

Research studies show growing evidence that Alzheimer's disease and Parkinson's disease are possibly caused by ________________________.

chemical pollution

A ____________________ describes how toxic a pollutant is by showing the effect of different dosage levels on an organism.

dose-response curve

The study of how diseases spread is ________________________________.

epidemiology

A living animal or plant on or in which a pathogen lives is a ____________________.

host

Natural pollutants, such as dust and soot, which are tiny enough to be inhaled are considered ____________________________.

particulates

The naturally-occurring, odorless gas that is thought to be responsible for thousands of cancer deaths per year is _________________.

radon

The evaluation of the health risks posed by a certain pollutant or chemical is a(n) _________________________________.

risk assessment

The study of the poisonous effects of substances on organisms is _______________________.

toxicology