20 Questions
Which hormone is responsible for the regulation of circadian rhythms?
Melatonin
At what time does melatonin typically reach its peak secretion level?
3 a.m.
Which hormone regulates energy homeostasis by increasing appetite and food intake?
Ghrelin
At what time does adiponectin begin secretion and ends at 8 p.m.?
11 a.m.
What is the role of adiponectin in metabolism?
Activates AMPK to increase glucose use and insulin sensitivity
At what time does insulin peak during the afternoon?
4 p.m.
What effect does leptin have on metabolism?
Increases lipolysis and inhibits fat accumulation
Which hormone is secreted by the liver at 4 a.m. and peaks at 6 a.m.?
FGF-21
When is melatonin produced signaling the beginning of the resting phase?
10 p.m.
Why is it more efficient to consume food earlier in the day during the active phase?
To enhance digestion and metabolization of nutrients
Melatonin secretion peaks at 10 a.m.
False
Cortisol secretion is inhibited by melatonin.
True
Ghrelin has two peaks of secretion during the day.
False
Adiponectin secretion begins at 10 a.m.
False
Adiponectin improves glycolysis and fatty acid oxidation by inhibiting AMPK activation.
False
Leptin stimulates fat accumulation and inhibits lipolysis.
False
Insulin induces catabolic processes during the afternoon.
False
FGF-21 promotes fatty oxidation and glycolysis inhibition.
False
Melatonin is secreted at 10 p.m. and marks the beginning of the active phase.
False
Eating food earlier in the day during the active phase is less efficient for digestion and metabolization.
False
Study Notes
Circadian Rhythms and Hormone Regulation
- Melatonin is responsible for regulating circadian rhythms.
- Melatonin typically reaches its peak secretion level at 10 p.m., signaling the beginning of the resting phase.
- Cortisol secretion is inhibited by melatonin.
Energy Homeostasis and Metabolism
- Ghrelin regulates energy homeostasis by increasing appetite and food intake.
- Ghrelin has two peaks of secretion during the day.
Adiponectin Regulation
- Adiponectin regulates metabolism by improving glycolysis and fatty acid oxidation.
- Adiponectin secretion begins at 10 a.m. and ends at 8 p.m.
- Adiponectin inhibits AMPK activation to improve glycolysis and fatty acid oxidation.
Insulin and Leptin Regulation
- Insulin regulates metabolism by inducing anabolic processes.
- Insulin peaks during the afternoon.
- Leptin stimulates fat accumulation and inhibits lipolysis.
Efficient Food Consumption
- It is more efficient to consume food earlier in the day during the active phase for better digestion and metabolization.
- FGF-21 promotes fatty acid oxidation and glycolysis inhibition.
Test your knowledge on the biological clock known as circadian rhythms and the hormone melatonin that regulates sleep patterns. Learn about the characteristic pattern of melatonin secretion and its impact on our daily cycles.
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