Study Guide # 3

Question 1

64. What is the role of the suprachiasmatic nucleus (SCN) in regulating circadian rhythms?

Answer 1

It is the region of the brain serving as a biological clock that maintains circadian rhythm for a 24 hour period. This keeps track of the daylight.

The black represents activation od the cells. Light activity is shown in the night.

Question 2

65. Describe the retinohypothalamic pathway and the role of melanopsin.

Answer 2

( Cortical pathway) Optic nerve that extends from the retina to the SCN.
- Not important for vision

Question 3

67 Can melatonin be used to shift circadian rhythm?

Answer 3

It does not induce sleep, but helps as a sleep aid. It does not maintain sleep.

Answer 4

EEG: Measures electrical activity recorded from electrodes attached to a person’s scalp
- It measure gross electrical actiivty of the neocortex
EOG: Recording eye movements
EMG: Records physiological activity of muscles

Question 5

Stage 1 of Sleep

Question 6

Stage 3 of Sleep

Question 7

REM Sleep

Answer 7

High growth hormone release
- A lot of activity in the cortex.
-