Interactive Screencast

Referring to the unit, What are two sources of disease in the human body?

• Pollution and Allergens

• Viruses and Bacteria

• Stress and Fatigue

• Genetics and Environment

How do viruses and bacteria cause disease in the human body?

• By invading and destroying healthy cells

• By disrupting homeostasis

• By releasing toxins into the bloodstream

• By triggering an immune response

Why are bacteria and viruses such a threat?

• Reproduce quickly

• Live in many different environments

• We can not see them

• They can not evolve quickly

How do bacteria causes diseases?

• Use cells for food

• Release toxins that damage cells

• They do not invade organisms

• Create an environment that is inhospitable to other organisms

How do viruses cause diseases?

• They produce toxins that damage cells

• They target specific tissues

• They do not interfere with the body's immune system

• They do not replicate inside the host cells