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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.
Herb Stage - Xerarch The Soil-forming and soil-holding reactions of the mosses are so pronounced that the seeds of various xerophytic herbs, especially short-lived annuals: ar
Types of Glials Cells and their Functions In the nervous tissue, besides the nerve cells there is one other cell type -the neuroglia which is present in large numbers and occu
Vegetative Development - Differentiation It is referred to as qualitative changes that lead to increased specialisation. For example, the formation of cells and tissues of roo
Q. What are the events that mark the end and the beginning of the first interphase period? What happens inside the cell in this period? The initial interphase period is the G1.
What is the difference between a hormone and a morphogen? How do they act and what type of development do they control?
what is feeding mechanism
how respiration takes place in mammls and reptiles
Q. What do you know about Tricuspid stenosis? It is rare disease, with rheumatic etiology seen in 90 per cent of cases. In patients with rheumatic mitral stenosis only 3-5 per
Congenital Aortic Stenosis : The valve may be unicuspid, bicuspid or tricuspid. Rarely it is a dome shaped diaphragm. Uni commissural aortic stenosis produces significant sy
Q. Bird identity card. How are birds characterized according to examples of representing beings, basic morphology, respiration, skin, nitrogen waste, circulation,thermal control an
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