Chapter 7C Flashcards
1
Q
circadian rhythms
A
biological processes that coordinate the timing of activity of body systems over a 24-hour period
2
Q
ultradian rhythms
A
biological processes that coordinate the timing of activity of body systems over periods of less than 24 hours.
- e.g. heart rate, digestion
3
Q
suprachiasmatic nucleus
A
a master body clock in the hypothalamus that regulates body activities to a daily schedule of sleep and wakefulness
4
Q
melatonin
A
a hormone that induces drowsiness and decreases cell activity
