pineal glandendocrine gland that secretes melatonin, which is important in regulating the sleep-wake cycle pinealocytecell of the pineal gland that produces and secretes the hormone melatonin pituitary dwarfismdisorder in children caused when abnormally low levels of GH result in growth retardation pitui...
C.Thepinealglandsecretesmelatonin.D.Theadolescentswakeupearly.(2)Whatdoesthesecondparagraphmainlytellusaboutmelatonin? ___A.Itsformation.B.Itstemperature.C.Itsrole.D.Itspotential.(3)Whatdoweknowaboutteenagers'sleep? ___A.Thelengthofsleepcaninfluenceteenagers'brainhealth.B.Theearlysecretionofmelatoninmakes...
A.The students want to stay up.B.The shifts of the sleep cycle.C.The pineal gland secretes melatonin.D.The adolescents sleep late.【小题3】The teens go to sleep later than before because ___.A.melatonin is secreted much laterB.melatonin regulates the sleep timeC.they sleep a lot i...
结合选项:A.The students want to stay up.学生们想熬夜;B.The shifts of the sleep cycle.睡眠周期的变化;C.The pineal gland secretes melatonin.松果体分泌褪黑素;D.The adolescents sleep late.青少年睡得很晚。故选B。(3)A.细节理解题。根据文章第三段的In teens,melatonin is secreted m...
C.The pineal gland secretes melatonin. D.The adolescents sleep late. 解析:选 B 代词指代题。其次段提到了睡觉周期的转变,第三段紧接着解释造成这一现象的缘由,因 此 this 指睡觉周期的转变,故 B 项正确。 3.The teens go to sleep later than before because ___. A.melatonin is secr...
aThe pineal gland is situated in the diencephalon just above the roof of the midbrain. This gland is considered an intricate and highly sensitive biologic clock, because the secretory acivity of the pineal gland is greatest at night. The pineal gland secretes melatonin, which affects the size an...
C.The pineal gland secretes melatonin. D.The adolescents wake up early.2. What does the second paragraph mainly tell us about melatonin? A.Its formation. B.Its temperature. C.Its role. D.Its potential.3. What do we know about teenagers’ sleep? A.The length of sleep can influence teena...
When we are babies, the gland produces lots of it, but as adults, the gland secretes less, almost exclusively at night.'Melatonin levels increase all through the night, then gradually tail off towards dawn,' explains Richard Wurtman, professor of neuropharmacology at the Massachusetts Institute ...
en·do·crine gland (ĕn′də-krĭn, ĕn′də-krēn′) Any gland of the body that produces hormones and secretes them directly into the bloodstream. In mammals, the thyroid gland, adrenal gland, and pituitary gland, as well as the ovary, testis, and pancreas are all endocrine g...
epiphysis cerebri, pineal body, pineal gland, epiphysis - a small endocrine gland in the brain; situated beneath the back part of the corpus callosum; secretes melatonin islands of Langerhans, isles of Langerhans, islets of Langerhans - cell clusters in the pancreas that form the endocrine part ...