An epithalamus gland {pineal gland}| can control circadian rhythms. In most animals, pineal gland receives light from retina. In species with third eyes, pineal gland receives from third eye. Light on pineal gland releases melatonin into blood. Pineal N-acetyltransferases act like biological clocks. Pit vipers combine infrared system with other sense modes.
Pineal prevents pituitary from secreting gonadotrophic hormones. After pineal control relaxes, adolescence starts.
Biological Sciences>Zoology>Organ>Endocrine Gland>Glands
4-Zoology-Organ-Endocrine Gland-Glands
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Date Modified: 2022.0224