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Figure 17-1 The Citric Acid Cycle
Use Figure 17-1 to identify the element marked with a letter. (Example: CO₂, H₂O)
-The ion(s) or molecule(s) labeled G is (are)
Biological Clock
An internal mechanism that regulates bodily rhythms and cycles, such as the sleep-wake cycle, on a roughly 24-hour schedule.
Hypothalamus
A region of the brain that plays a crucial role in many essential functions, including hormone release, regulation of body temperature, and control of hunger and thirst.
Premenstrual Syndrome (PMS)
A condition that affects a woman's emotions, physical health, and behavior during certain days of the menstrual cycle, generally just before her menses.
Menstrual Cycle
The monthly series of changes a woman's body goes through in preparation for the possibility of pregnancy.
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