Desease

• How vaccinations work to protect the human body from diseases

  Explain
• Negative feedback loop


  Contrast with positive feedback loop
• Positive feedback loop


  Contrast with negative feedback loop
• Calculate how fast an object is moving

  Given: Kinetic energy = 12 J, Mass = 22 kg
• Calculate the frequency of a wave

  Given: Wave traveling at 187 m/sec, Wavelength = 2.9 meters
• Disease


  Any condition that impairs the normal functioning of an organism
• Types of disease


  • Infectious
  • Non-infectious
• Infectious diseases


  • Caused by infectious agents, called pathogens, which can be passed from one individual to another
• Non-infectious diseases


  • Inherited diseases
  • Nutritional diseases
  • Environmental diseases
• Pathogens


  Microorganisms that can cause disease, including tapeworm, head lice, liver flukes, fungi, protozoa, bacteria, viruses and prions
• Parasites


  Organisms that live at the expense of their hosts and need a host to survive
• Types of parasites


  • Endoparasites (live inside an organism)
  • Ectoparasites (attach to the outside of an organism)
• Vectors

  Organisms that carry pathogens between organisms
• Bacteria


  • Microscopic single-celled organisms that thrive in diverse environments
  • Can be helpful or destructive
• Viruses


  • Intracellular parasites that cannot replicate outside of cells
  • Composed of genetic material (DNA or RNA) enclosed in a protein coat (capsid)
  • Infect all types of living things, even bacteria