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### 13 Cards in this Set

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 Calculate metric conversions using the metric millimeter (mm) and centimeter (cm) units. milli: 1/1000th centi: 1/100th 10mm = 1 cm 2.54 cm = 1 inch None Define the term “ratio” an expression that compares two numbers or quantities by division None Define the term “proportion.” a mathematical statement of the equality of two ratios Show, through step-by-step calculation, how to solvea proportion for an “unknown.” Describe the proper procedures in setting up the physiograph for use. Describe the proper procedures closing down the physiograph and preparing it for storage. Describe the basic design of the physiograph. List all the major components of the physiograph system and describe their function. 1. Input transducer: converts a physiological event into a proportional signal 2. Electrode: carries an electrical current into/away from specimen 3. Coupler: renders the input energy from the transducer from the subject compatible with the channel amplifier 4. Amplifier: increases the strength (gain) of the electrical signals obtained from the transduced physiological activity (Preamplifier: amplifies small bioelectric potentials and sends them to the amplifier) None Describe the balancing of a physiograph channel. Set the desired pen position with the POSITION knob. Set the Sensitivity to “2” (which is the highest sensitivity). Push the RECORD button ON (in). If the pen moves (leaving the RECORD button ON) use the BALANCE knob to bring the pen back to the desired position. (clockwise moves the pen upward). Push the RECORD button OFF and ON to check for balance. If the pen does not move, the channel is balanced. If the pen moves, repeat step #3 until the pen does not move. None Describe and state the significance of calibrating the physiograph. Describe the difference between the vertical and horizontal calibrations. Calibration: setting a known standard for both the vertical and horizontal axes of the physiographic recording; needed during quantitative analysis (without results are meaningless) vertical measurements (upward deflections): affected by sensitivity (gain) horizontal measurements: affected by paper speed None Describe the use/function of the sensitivity and position knobs on the channel amplifier. the relative amount of electrical input required to move the pen a specific distance on the recording paper (the lower the number, the higher the sensitivity setting). None Describe the use/function of the frequency and multiplier knobs on the stimulator. Mode toggle switch: used for single or multiple stimulations. Frequency knob: used with multiple stimulations to set the # of pulses/second. Voltage knob: used to set the amplitude of the stimulation pulse Multiplier knob: used to extend the voltage scale by factors of 1X, 10X, 100X Output terminals: STIM terminal used for stimulation; MAG terminal used for time/event marker None Given a pulse recording, calculate the time interval between pulses and determine pulse rate.