Artificial light, extended work-time and reduced sleep-time disrupt the activity of
1. Thymus gland | 2. Pineal gland |
3. Adrenal gland | 4. Posterior pituitary gland |
Melatonin:
1. levels decrease in darkness and increase in daylight.
2. is secreted by the hypothalamus.
3. is secreted by the pineal gland under the control of the anterior pituitary.
4. is secreted by the pineal gland under the control of the hypothlamus.