Examlex
In both tunicates and cephalochordates,the ventral side of the pharynx contains a ciliated,mucus-secreting groove,the ____________.
Circadian Clock
An internal biological clock regulating the sleep-wake cycle and other physiological processes on roughly a 24-hour cycle.
Internal Clock
An innate mechanism that regulates physiological and behavioral functions in a roughly 24-hour cycle, also known as the circadian rhythm.
Pineal Gland
A small endocrine gland in the brain, secreting melatonin and involved in regulating sleep patterns.
Thyroid Gland
The endocrine gland that produces thyroxine and regulates metabolism.
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