Zadanie 5a
State the missing entries P, Q and R in this summary of human endocrine signalling.
- Tabela do uzupełnienia
Melatonin and daily sleep timing
Relate the daily pattern of pineal melatonin secretion to circadian regulation of sleeping and waking.
Tę umiejętność sprawdza 8 zadań wzorowanych na arkuszach IB z lat 2022–2026.
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Zadanie 28
A person normally sleeps from about 01:00 until 07:30. The 24-hour clock shows four positions. Around which position would melatonin normally be highest? A. A B. B C. C D. D
- Materiał graficzny
Zadanie 28
After rapid travel across time zones, a person remains alert late into the local night. Which endocrine mismatch can contribute? A. Excess melanin released from the hypothalamus B. Release of oxytocin from the thyroid at sunset C. Loss of insulin release from…
Zadanie 27
Which environmental change normally favours increased pineal melatonin secretion? A. A rise in dietary calcium B. An increase in blood glucose C. The transition to darkness D. A loud sound at noon
Zadanie 2d
Human sleep timing is coordinated with the day–night cycle. Outline how melatonin contributes to this coordination.
Zadanie 4a
State the organ that produces melatonin.
Zadanie 4b
A traveller crosses several time zones. Deduce, with a reason, the local time of day at which restoring a rise in melatonin would support the usual sleep–wake cycle.
Zadanie 25
Light inhibits pineal melatonin secretion. A model daily cycle is shown; usual bedtime is 22:00. Which effect could bright screen exposure around bedtime have? A. Delay the evening rise in melatonin B. Force the peak to occur before sunset in every person C.…
- Materiał graficzny