Biology, 06.12.2019 02:31 bobbyhsu3751
How is nighttime acth secretion related to expected sleep duration? humans secrete increasing amounts of adrenocorticotropic hormone (acth) during the late stages of normal sleep, with the peak secretion occurring at the time of spontaneous waking. because acth is released in response to stressful stimuli, scientists hypothesize that acth secretion prior to waking might be an anticipatory response to the stress associated with transitioning from sleep to a more active state. if so, an individual’s expectation of waking at a particular time might influence the timing of acth secretion. how can such a hypothesis be tested? in this exercise, you will examine how researchers designed a controlled experiment to study the role of expectation. researchers studied 15 healthy volunteers in their mid-twenties over three nights. each night each subject was told when he or she would be awakened: 6: 00 or 9: 00 a. m. the subjects went to sleep at midnight. subjects in the "short" or "long" protocol group were awakened at the expected time (6: 00 or 9: 00 a. m., respectively). subjects in the "surprise" protocol group were awakened at 6: 00 a. m., three hours earlier than expected, under the pretense of a technical problem. at set times, blood samples were drawn to determine plasma levels of acth. to determine the change (δ) in acth concentration post-waking, researchers compared samples drawn at waking and 30 minutes later.
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Biology, 22.06.2019 09:10
In general, are there any major differences that you can see? explain
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Biology, 22.06.2019 14:30
Which statement is not an accurate description of meiosis? a) meiosis produces offspring that are genetically diverse. b) meiosis produces offspring that are identical to the parent. c) in sexual reproduction half of the genetic material comes from the father (sperm) and half of the genetic material comes from the mother (egg). d) meiosis decreases the number of chromosomes by half so that when a sperm fertilizes an egg, the resulting zygote has the correct number of chromosomes.
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Biology, 22.06.2019 17:00
As the earth formed, the force of gravity increased due to increased mass. what effect did this increased gravity have on the forming planet?
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Biology, 22.06.2019 17:50
Babies with very low or very high birth weight are less likely to survive. observe a graph of the data. me % babies born at different weights - babies born in that category which statement is a valid claim that could be made using the data in the graph? directional selection is occurring because the graph favors an extreme. mark this and totum save and exit next submit type here to search
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How is nighttime acth secretion related to expected sleep duration? humans secrete increasing amoun...
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