10 Questions
What is the primary function of a zeitgeber?
To regulate an organism's internal clock
Which brain area is responsible for serving as the master internal clock?
Hypothalamus
What is the primary advantage of biological rhythms?
Improved coordination with the environment
Which type of biological rhythm is approximately monthly?
Circalunar
What is the term for the daily biological rhythm?
Circadian
Where is the master internal clock, the suprachiasmatic nucleus (SCN), located in the brain?
Above the optic chiasm in the hypothalamus
What is the role of the Clock/Cycle_BMAL dimer in the molecular clock?
It promotes the transcription of the PER and CRY genes
How does light entrain the molecular clock in the SCN?
Through the transmission of signals from retinal ganglion cells
What is the role of melatonin in determining the time of year in animals?
It measures day and night length
How can hormones indirectly affect the SCN?
By modulating the activity of neurons that communicate with the SCN
Learn about the different types of biological rhythms, including daily, monthly, and yearly cycles. Examples of each type are provided, including rabbit behavior, reproductive cycles, and migration patterns. Understand how these rhythms affect living organisms and their adaptive significance.
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