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PINEAL GLAND (EPIPHYSIS CEREBRI) -
Hormone - Melatonin concentration in the blood appears to flow a diurnal (day-night) cycle as it arises, in the evening and through the night and drops to a low around noon. Because of this light mediated response, the pineal gland may act as a kind of "biological clock" which may produce circadian rhythms (variations following a 24 hour cycle).
Girls blind from birth attain puberty earlier than normal, apparently because there is no inhibitory effect of melatonin on ovarian function.
Explain Some Ethological Activities Comparative studies of behaviour or activities are also used in systematic for identification of organisms. The comparative study of the beh
reproduction mode
will argon tend to form bonds with other elements?
Seed A seed is a mature ovule enclosing an embryonic plant, stored food material (in endosperm, persistent nucellus or embryo itself) and a seed coat formed by one or two inte
Explain the term 'health' Mention any two ways of maintaining it. Why does a doctor administer tetanus antitoxin and not a tetanus vaccine to a child Injured in a roadside acci
Pulmonary valve is surface marked at the sternal end of the left 3rd costal cartilage. Aortic valve is surface marked at the sternal margin of the left 3rd intercostal space. Mitra
What purpose does sleep serve for the brain? A. We don't yet know full answer to this fundamental question however neuroscience is providing intriguing clues. It's increasingly
In unilocular ovary with a single ovule the placentation is : 1. Marginal 2. Basal 3. Free Central 4. Axile Basal
Define Fluids requirement to avoid underweight problem? Take fluids only after a meal instead of with or before meals so that food intake is not reduced. High calorie nourishin
discuss why obelia is considered to be of special interest in zoology as an animal showing an intermediate grade of organisation
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