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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.
What is root cap? Root cap is a protective structure located in the tip of the growing root. It defends the meristematic tissue of the root forming a cap that surrounds the tip
Q. What do you mean by Maxilla? The maxilla has ample keratinized tissue that covers the entire palate. This tissue is well-attached and more difficult to mobilize. Nevertheles
A DNA library is a collection of cloned DNA fragments in a cloning vector which can be fined for a DNA of interest. If the target is to isolate particular gene sequences.
What is Glycolysis in Cell Metabolism? Glycolysis : is the process that breaks down glucose into pyruvate and energy. Glycolysis does not require the presence of oxygen and
What is malnutrition? Malnutrition can be defined as a pathological condition resulting from a relative or absolute deficiency or excess of one or more of the essential nutrien
A common biocontrol agent for the control of plant diseases is : 1. Baculovirus 2. Bacillus thuringiensis 3. Glomus 4. Trichoderma Trichoderma
what is vaso-constriction
THEORY OF ORGANIC EVOLUTION - LAMARCKISM Theory of the inheritance of acquired characters or Lamarckism put forwarded by Jean Baptist de Lamarck (1809) in his book "
Choose the correct answer. A. The phenotype determines the genotype. B. True-breeding individuals are produced by repeated backcrossing. C. Recessive alleles are usually loss-of-fu
WHY PROTOXYLEM LACK TYLOSIS?
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