BIOL 404-Exam 4-CNS 1

  1. How is and Electrocephalogram operated?
    ~19 electrodes attached to head with a salt paste to transmit postsynaptic electrical impulses from the surface of the brain
  2. How are wave forms measured in an EEG?
    • frequency in Hz
    • Amplitude uV
  3. The higher the frequency, the ________the Hz?
  4. The lower the frequency, the _________the Hz
  5. What is a typical frequency range for an EEG?
  6. What is amplitude measured in?
  7. What does epileptic seizure look like in an EEG?
    • Image Upload 1
    • lowHZ
    • high uV     
  8. Why is the amplitude higher on EEG during a seizure?
    More neurons firing at the same time
  9. The amplitude can reach what level during an epileptic seizure?
    100 uV
  10. When can the amplitude of an EEG reach 100mV?
    epileptic seizure
  11. Describe and Alpha rythym:
    • Image Upload 2
    • Low Hz (4-12 or 8-14 Hz)
    • Higher uV      
  12. What is the behavior during alpha rhythms?
    relaxed with eyes closed
  13. When you are relaxed with your eyes closed, what type of wave pattern do you expect on an EEG?
    Alpha rhythm
  14. Describe Beta rhythms:
    • Image Upload 3
    • High Hz (13-40Hz)
    • Low uV
  15. What is the behavior during beta rhythms?
  16. When you are alert what EEG pattern would you expect?
    Beta rhythms
  17. Relaxed drowsiness has what type of EEG?
    Both Hz and uV decline, UV can increase later
  18. How many accidents per year due to tired drivers?
  19. How many dollars per year due to workplace sleepiness?
    150 billion
  20. How many Americans are sleep deprived?
    400 million
  21. What is the purpose of sleep?
    • Conserve energy
    • repair and growth
    • learning and memory consolidation
  22. What can occur with sleep deprivation?
    • Less: hallucinogenic phenomena
    • More: Coma and death
  23. What happens to the body temperature when you sleep?
  24. What happens to GH levels during sleep?
  25. Why do growth hormone levels increase during sleep?
    Growth occurs at night when metabolism for activity is low
  26. What system regulates sleep and wakefulness?
    Endogenous circadian rhythms
  27. How much sleep do most adults need?
    6-7 hours
Card Set
BIOL 404-Exam 4-CNS 1
BIOL 404-Exam 4-CNS 1