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Adrenocortical Steroids - Vertebrates
The adrenal cortex secretes two types of steroid hormones:
This distinction between glucocorticoids and mineralocorticoids is found in mammals where as nonmammalian vertebrates do not maintain such distinction. In general the action of corticosteroids is adaptive. Salt output or retention is altered in accordance with environmental demands.
In mammals aldosterone, a mineralocorticoid is concerned with electrolytd balance. It is produced in response to adrenoeorticotropic hormone (ACTH) secreted by the pituittary. ACTH itself is released in response to a corticotropin releasing factor (CRF) from the hypothalamus. Glomerulotrophic hormone from the pineal gland is also known to stimulate aldosterone secretion. In nonmammalian vertebrates apart from aldosterone, another mineralocorticoid, cortisol is known to promote NaCl absorption. The mineralocorticoids increase the tubular absorption of sodium and promote the renal excretion of potassium.
Is monoculture a system that contributes to great biological diversity of an ecosystem? Monoculture means that in a large area a single crop (only single species of plant) is c
Typical Form or Reparative Regeneration - Heteromorphosis Sometimes the part which grows back is not the same as that which was lost. The phenomenon is called Heteromorphosis.
Aeration is the process on which water and air come into contact. It is carried out by spraying water in the form of spray or fountain over air. Aeration achieves the following obj
There are two distinct methods through that cells synthesize ATP. In oxidative phosphorylation which containing the electron transport chain and the generation of ATP is linke
MEDULL A OBLONGATA - Conical in appearance. Lower most part of hind brain. It's lumen is metacoel or 4th ventricle. An oval mass pons virolli lies above medula oblongeta. I
Two important human fossils that throw much light on the human ancestory were discovered in .Olduvai beds in Africa and in central Java respectively. Although the development of bi
Explain the Meaning of Transfer of Culture Transfer of culture can be done from one liquid media to another liquid media or from liquid to solid media or vice versa. The steps
what is test cross?
BASIC PRINCIPLES OF EMERGENCY PSYCHIATRY: Nurses handling psychiatric emergencies should keep the following principles in mind: The initial approach to a clienvpatien
To prevent and control Staphylococcal food poisoning: • Avoid contamination of foods • Kill organism by heating, refrigeration • Personnel hygiene • Adequate cookin
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