ch 10 outline

ch 10 outline - Ch 10 outline: 10.1 Endogenous cycles:...

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Ch 10 outline: 10.1 Endogenous cycles: Endogenous circannual rhythm – an example is when a bird generates a rhythm that prepares it for seasonal change. Circadian rhythm lasts a day. Humans generate wake-sleep rhythms. Some people become productive early in the morning, and others reach their peak in the late afternoon or evening. Setting and resetting the biological clock: Light is critical for resetting circadian rhythms. A free running rhythm is one that occurs when no stimuli reset or alter it. The stimulus that resets the circadian rhythm is zeitgeber, meaning time-giver. Blind people set their rhythms by utilizing noise, temperature, meals, and activity. Jet lag: Jet lag – disruption of circadian rhythms due to crossing time zones. Going west, we phase delay our circadium rhythms. Going east, phase advance takes over (sleep earlier and wake earlier). Shift work: Irregular sleepers like medical interns, pilots, and factory workers all have different durations of sleep form day to day. They sleep when they can, and often feel groggy on the job. Artificial lighting prevents circadian rhythm from changing for workers who work at night. Suprachiasmatic nucleus:
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The biological clock depends on part of the hypothalamus, called the SCN. The SCN provides the main control of the circadian rhythms for sleep and body temperature. If SCN is damaged, body’s rhythms are less consistent.
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This note was uploaded on 10/28/2010 for the course BIO 392 taught by Professor Tomkiel during the Spring '06 term at UNC Greensboro.

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ch 10 outline - Ch 10 outline: 10.1 Endogenous cycles:...

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