Hormones modify the biochemical activity of a target cell or tissue. Two basic mechanisms are involved. Fixed - Membrane - Receptor Mechanism The fixed - membrane - receptor mechanism, applies…
At the cells of the target organ, the hormone acts as a "first or extracellular messenger", binding to a specific receptor site for that hormone on the plasma membrane. The…
The concentration of a hormone in the plasma depends on two factors: i) Its rate of secretion, and ii) the rate at which it is inactivated and removed from the…
In terms of their chemical structure, hormones can be grouped into two general classes: i) lipid, or steroid, hormones ii) hormones derived from amino acids. Steroid hormones, which include the…
An animal hormone (Grhormaein, to set in motion or to spur on) is a chemical signal that is secreted into body fluids, most often into the blood, by specialized cells…
Chemical messengers are involved in communication in maintaining homeostasis in an animal's body, and in the body's response to various stimuli. The development of most animals commences with fertilization and…
Differentiate between simple and compound tissues. Ans: The tissues with similar type of cells are called simple tissues. Examples: parenchyma, collenchyma and sclerenchyma. The tissues Yvith different types of cells…
Ricca Scientific classification Division Bryophyta Class Hepaticae Order Marchantiales Family Ricciaceae Genus Riccia OCCURRENCE The genus Riccia has aboutI30 species. Some botanists have reported its 200 species. Many of its…
Introduction Hormones are chemical messengers synthesized by special endocrine and other cells and transported by the blood to target cells where they affect cell function by altering specific biochemical processes.…
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