| local circuit theory | <physiology> A generally accepted model for neuronal conduction, by which depolarisation of a small region of a neuronal plasma membrane produces transmembrane currents in the neighbouring regions, tending to depolarise them. As the sodium channels are voltage gated, the depolarisation causes further channels to open, thus propagating the action potential. (18 Nov 1997) |
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| anaesthesia, closed-circuit | Inhalation anaesthesia where the gases exhaled by the patient are rebreathed as some carbon dioxide is simultaneously removed and anaesthetic gas and oxygen are added so that no anaesthetic escapes into the room. Closed-circuit anaesthesia is used especially with explosive anaesthetics to prevent fires where electrical sparking from instruments is possible. (12 Dec 1998) |
| anaesthetic circuit | Equipment used during inhalation anaesthesia to regulate concentrations of inhaled gases; includes a reservoir bag and usually directional valves, breathing tubes, and a carbon dioxide absorber. (05 Mar 2000) |
| break-circuit | <physics> A key or other device for breaking an electrical circuit. Source: Websters Dictionary (01 Mar 1998) |
| Papez circuit | A long circuitous conduction chain in the mammalian forebrain, leading from the hippocampus by way of the fornix to the mammillary body and thence returning to the hippocampus by way of, sequentially, the anterior thalamic nuclei, cingulate gyrus, and parahippocampal gyrus. (05 Mar 2000) |
| reverberating circuit | A theory of periodic conduction through the cerebral cortex of trains of impulses traveling in circuit's of neurons. (05 Mar 2000) |
| circuit | The path or course of flow of cases or electric or other currents. Origin: L. Circuitus, a going round, fr. Circum, around, + eo, pp. Itus, to go (05 Mar 2000) |
| closed circuit method | A method for measuring oxygen consumption in which the subject rebreathes an initial quantity of oxygen through a carbon dioxide absorber and the decrease in the volume of oxygen being rebreathed is noted. (05 Mar 2000) |
| short-circuit | <physics> A circuit formed or closed by a conductor of relatively low resistance because shorter or of relatively great conductivity. <physics> To join, as the electrodes of a battery or dynamo or any two points of a circuit, by a conductor of low resistance. Origin: Short-circuited; Short-circuiting. Source: Websters Dictionary (01 Mar 1998) |
| open circuit method | A method for measuring oxygen consumption and carbon dioxide production by collecting the expired gas over a known period of time and measuring its volume and composition. (05 Mar 2000) |
| anaesthesia, local | Anaesthesia confined to one part of the body. Infiltration anaesthesia produces local anaesthesia by deposition of a local anaesthesia solution in the area of small, terminal nerve endings. (12 Dec 1998) |
| anaesthetics, local | Drugs that block nerve conduction when applied locally to nerve tissue in appropriate concentrations. They act on any part of the nervous system and on every type of nerve fibre. In contact with a nerve trunk, these anaesthetics can cause both sensory and motor paralysis in the innervated area. Their action is completely reversible. Nearly all local anaesthetics act by reducing the tendency of voltage-dependent sodium channels to activate. They are commonly used not only in the peripheral nervous system, but also for spinal anaesthesia. The many drugs that have local anaesthetic actions as a side effect but are not used for their local anaesthetic action are not included here. (12 Dec 1998) |
| anti-infective agents, local | Substances used on humans and other animals that destroy harmful microorganisms or inhibit their activity. They are distinguished from disinfectants, which are used on inanimate objects. (12 Dec 1998) |
| neoplasm recurrence, local | The local recurrence of a neoplasm following treatment. It arises from microscopic cells of the original neoplasm that have escaped therapeutic intervention and later become clinically visible at the original site. (12 Dec 1998) |
| local | Restricted to or pertaining to one spot or part, not general. Origin: L. Localis (18 Nov 1997) |