Question 1
Paper 2Easy5 marksA healthy adult’s pineal gland secretes melatonin. The table shows relative melatonin secretion over 24 hours. A student walks along a narrow beam while catching a ball.
| Time | Relative melatonin secretion / arbitrary units |
|---|---|
| 08:00 | 2 |
| 14:00 | 1 |
| 20:00 | 5 |
| 02:00 | 9 |
| 08:00 next day | 2 |
(a)[1]
Describe the pattern of melatonin secretion shown in the table.
(b)[2]
Explain how this pattern helps establish a cycle of sleeping and waking.
(c)[2]
State two roles of the cerebellum in the student’s movements.