Dictionary,Defintion,Meaning,What is Adaptive Enzyme, Adrenegic, Adaptive Radiation, Adaxial, Adenine, Adenosine, Adnate, Adoral, Adrenal Glands

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Home >>Biology Dictionary >> Adaptive Enzyme - Adrenegic

Your Ad Here	Adaptive (Inducible) Enzyme Enzyme formed by an organism in appreciable amounts only in response to the presence of its substrate or of a structurally similar substance. Bacteria especially are known to adjust their enzyme make-up in this way. Adaptive radiation Evolution, from one species of organism of several divergent forms adapted to distinct modes of life e.g. at beginning of Tertiary the basal stock of placental mammals radiated into many forms adapted to flying, running, swimming, burrowing, etc. Adaxial (of a leaf) facing the stem.
Adnate Joined to an organ of a different kind. Adoral The side on which the mouth is situated. Adrenal glands A pair of endocrine glands that are situated closely above each kidney and produce the hormone adrenaline. Secretion is controlled by the nervous system. The adrenal glands have a central medulla and an outer cortex, each behaving independently. The former produces noradrenaline and adrenaline. The adrenal cortex is rich in vitamin C and cholesterol. Three types of hormones are produces: Aldosterone, cortisol and sex hormones.
Adrenaline (Adrenine epinephrine). A hormone secreted together with closely related noradrenaline, by the medulla of the adrenal gland. Both substances are also secreted at many post-ganglionic nerve endings of sympathetic nervous system, and this accounts for similarity of the action of adrenal medullary hormone to the effects of massive stimulation of sympathetic system (increased work of heart, blood pressure and blood-sugar; dilation of blood-vessels of muscles, heart and brain and contraction of those of skin and amounts of adrenaline and noradrenaline secreted very between different species of vertebrate. The two hormone have similar but not identical action. Both occur in some invertebrates. Adrenaline is amino-hydroxyphenyl-propionic acid, a catecholamine. Adrenergic Describing a motor nerve fibre, secreting at its end noradrenaline or (less usually) adrenaline when nerve-impulse arrives there. These substances stimulate the effector innervated by the nerve fibre. Many vertebrate sympathetic motor nerve fibres are adrenergic.	Your Ad Here
Adventitious Describing organs or other structures that arise in unusual positions. For example ivy has adventitious roots growing form its stems. Aepyornis A very large flightless recently extinct bird from Madagascar. It was larger than an ostrich and the egg content was in excess of 9 litres. Aerenchyma A tissue of thin-walled cells with large, air-filled intercellular spaces, found in roots and stems of some aquatic and marsh plants. Adenine A purine derivative. It is one of the major component bases of nucleotides and nucleic acids DNA and RNA.
Your Ad Here	Aerobe. Any organism that can survive only in the presence of oxygen required for aerobic respiration. Aerobic respiration. Respiration requiring free (i.e. gaseous or dissolved) oxygen. The reaction can be summarized by the equation. C₆H₁₂O₆+6O₂®6CO₂+6H₂O+energy Aerotaxis. The movement of an organism with reference to the direction of air or oxygen.

Adenohypophysis
That part of the Pituitary gland derived embryologically from the hypophysis.

Adenosine
Containing compound consisting of an Adenine base attached to a ribose sugar. Adenosine forms part of nucleotides making up nucleic acids and ATP.

Afferent
Carrying towards, e.g. of arteries leading to vertebrate gills; or of never fibres conduction impulses towards central nervous system (sensory fibres).

Aestivation. (1) (Bot.). The arrangement of the parts in a flower-bd. (2) In zoology hormancy during summer or dryseason; it occurs e.g.; in lung-fish (Dipnoi).

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