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Neurochemistry of Attention
Different neurotransmitters systems are implicated in attention. Cholinergic, dopaminergic and serotonergic systems play major roles in neurochemical machinery of attention.
Acetylcholine: More than any other neurotransmitter, acetylcholine has been implicated in attentional processes. Blockage of Muscarinic receptors by a drug scopolamine (antagonist) results in impaired performance on a number of task measuring sustained attention. On the other hand Nicotine (agonist) administration improves task performance on the measures of sustained attention. Lesions of the basal forebrain cholinergic system result in impaired attentional function in rats and monkeys. Therefore it seems that increased level of acetylcholine is important for sustained attention.
Non-Surgical Therapy The most conservative approach to treatment involves non-surgical therapy. This treatment modality includes three subcategories: a) Pharmacological ther
Nutrition of Embryo - In Vivo Studies The young proembryo derives its nutrition from ovular tissues with the help of suspensor. As the embryo develops its suspensor degenerate
What is an antigen? Antigen is any substance, particle or infectious agent known as foreign to the body. The contact of the antigen with the body promotes a defense reaction ag
Q. Can you define termination of the stress Test? Test should be terminated when: 1) PVCS develop in pairs or with increasing frequency or when ventricular tachycardia devel
What are the four groups of protozoans? The four major groups of protozoans are the sarcodines (that form pseudopods, like amoebae), the mastigophores (flagellated, such as the
Neurological Assessment The neurological assessment is made up of eight neurological criteria which have high, significance with gestational age. (Fig. 3.2) In order to perf
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Q. Explain the Wash Technique used in sterilization process? Use of artificial nails is contraindicated as is use of colored nail polish. Nails should be short enough to allow
GAS T RUL A TIO N - Morphogenic movements are occured. 3 germinal layers are formed. Ectoderm, endoderm & mesoderm. Endoderm is formed first. Mesoderm is formed in the
A small family was traveling in the car when a minor accident happened. The children in the back seats were wearing lap belts, but still sustained numerous bruises about the abdome
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