John travels frequently to distant parts of the globe. He believes that adjusting his mealtimes to the destination time zone is helpful in dealing with jet lag. After studying the material in your textbook, you tell John that
a. he's wasting his time, as adjusting his mealtimes will have little if any effect on jet lag.
b. he should expect some benefits, as his suprachiasmatic nucleus (SCN) is very responsive to changes in feeding patterns.
c. he should expect some benefits, as his peripheral clocks should respond to changes in feeding patterns.
d. this is a highly effective strategy, because both his SCN and peripheral clocks are highly sensitive to changes in feeding patterns.
Question 2
Which of the following is an accurate description of the effects of zeitgebers on the body's internal clocks?
a. Both the suprachiasmatic nucleus (SCN) and peripheral clocks are affected more by light than any other type of zeitgeber.
b. The suprachiasmatic nucleus (SCN) is more affected by light, whereas the peripheral clocks are more affected by feeding patterns.
c. The peripheral clocks are more affected by light, whereas the suprachiasmatic nucleus (SCN) is more affected by physical activity.
d. Both the suprachiasmatic nucleus (SCN) and peripheral clocks are affected more by physical activity and feeding patterns than by light.
The occurrence of flower parts in whorls.
Homunculus maps of human body parts along the cerebral cortex.
Gary Alvis, The Painted Hills, John Day Fossil Beds National Monument, Oregon.
The Graying of the Globe
Diagram of gastric ulceration by H. pylori. H. pylori travels through the stomach's mucus ...