Pineal Gland (Epiphysis) MCQ - Practice Questions with Answers
Edited By admin | Updated on Sep 18, 2023 18:34 AM | #NEET
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13 Questions around this concept.
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EASYThe diurnal rhythms are regulated by
A hormone responsible for normal sleep-wake cycle is
Circadian Rhythm is an endogenously driven cycle for biochemical, physiological and behavioral processes. In humans, the approximate duration of this 'biological clock' is :
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Concepts Covered - 1
Pineal Gland (Epiphysis)
- It is also known as Epiphysis or Third eye
- It develops from the ectoderm.
- The pineal gland is located on the dorsal side of forebrain.
- It is a small rounded body that protrudes from the roof of third ventricle
- Pineal gland secretes a hormone called Melatonin
- Melatonin is known as 'sleep hormone' because it promotes sleep
- Its secretion increases in dim light and decreases in bright light
- Melatonin follows a diurnal rhythm as it rises in the evening and through the night and drops to a low around noon
- Since it shows a light mediated response, pineal gland is regarded as 'biological clock' (circdian rhythm)
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