Which of the following is TRUE of melatonin? (There may be more than one answer. Please select all correct answers.)Group of answer choicesMelatonin is produced in response to darknessMelatonin is secreted by the pineal gland in the brainMelatonin helps to prepare the body for sleepLight exposure suppresses the production of melatonin

All of the statements are true about melatonin.

1. Melatonin is produced in response to darkness: This is true. The production of melatonin is influenced by the detection of light and dark by the retina of the eye. When it is dark, more melatonin is produced. When it is light, the production of melatonin drops.

2. Melatonin is secreted by the pineal gland in the brain: This is also true. The pineal gland is the part of the brain responsible for the production of melatonin.

3. Melatonin helps to prepare the body for sleep: This is true as well. Melatonin is often referred to as the "sleep hormone," as it helps signal to the body that it is time to prepare for sleep.

4. Light exposure suppresses the production of melatonin: This is true. Exposure to light, especially blue light from electronic devices, can suppress the production of melatonin and make it harder to fall asleep.