8/27/2013

8/27/2013

Answers:

Ampullopetal flow in the semicircular canals causes the posterior canal to ---, the horizontal canal to---and the superior canal to---their firing rate.
A) increase, increase, increase
B) decrease, decrease, decrease 
C) decrease, increase, increase 
D) increase, increase, decrease
E) decrease, increase, decrease

The horizontal canal increases firing rate when stereocilia bend toward the vestibule and decrease firing rate when they bend away. It is the opposite with the posterior and superior canals.

Arrange the following in order from the cochlea to the brain: auditory cortex, hair cells, medial geniculate bodies, afferent nerves, inferior colliculi, cochlear nuclei, lateral lemnisci, superior olive complexes

Hair cells-> afferent nerves-> cochlear nuclei-> superior olive complexes-> lateral lemnisci->inferior colliculi->medial geniculate bodies->auditory cortex

MC Question:

REM sleep makes up ---% of a typical night's sleep.
A) 5% 
B) 15% 
C) 25% 
D) 50% 
E) 65%

Free Response Question:
How long does a typical sleep cycle last? How many sleep cycles per night does an average adult have?

Quick Facts:
NREM Sleep Stages:  
-Stage I = transition phase, 2-5%, increased theta wave, decreased alpha waves.
-Stage II = 50% of sleep, K-complexes/spindles, decreased muscle tone/awareness.
-Stage III/IV=deep sleep, lots of delta waves, ~20% of sleep. Most restful sleep. Less w/ age.