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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.
Define the term - Hemiplegia The characteristics of hemiplegia (again, hemi means "half") are loss of voluntary movements on one side of the body, changes in postural tone, and
describe the factors which decide the broad area of scientific activity?
Cellulose is a polysaccharide which is composed of the unbranched chains of glucose; the major structural carbohydrate of the plants, insoluble in water, and indigestible in the h
What is the Population of Ecology explain? Ecology is also studied at a higher level of organization the population level. In biological terms, a population is defined as a gro
What are the main features of the meristematic cells? Why do these cells require to have a high mitotic rate? Meristematic cells have very thin cell walls, small vacuoles, a w
Wind Strong current of air is known as wind, it is an important ecological factor as it affects plant life mainly on flat plains, along sea coasts and at high altitudes in moun
Illustrate the term - Digestive caecum. A blind-ended pouch which extends from main digestive tract. Digestive ceca may be the sites for final digestion of ingested food or may
The biologicaI species concept claims that species consist of natural populations and that species are real and objective. They are not man-made subjective abstraction. According
Hydrophilic and some lipophilic hormones bind to cell surface receptors. These are necessary membrane proteins located in the plasma membrane which bind the signaling mol
Digestive Enzymes Now let us consider the general principles of digestion that are applicable t6all animals. We will start with the digestive enzymes that breakdown the large
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