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.
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 |
1. | Pineal | Located on the ventral side of the forebrain |
2. | Thymus | Located on the ventral side of aorta between lungs |
3. | Adrenal | Located at the superior pole of each kidney |
4. | Parathyroid | Located on the back side of the thyroid gland |