Critical Thinking Assignment 4: Physiological Instrumentation Use your lab manua

Question

Critical Thinking Assignment 4: Physiological Instrumentation Use your lab manual and your recently acquired expertise on Powerlab to answer the following questions. 1. The following is a recording a finger pulse recorded at a range of 2.5 volts a. How many mV is 2.5 V? (2 pts). b. Why do you not see any peaks? (2 pts) c. What is a reasonable range to record a finger pulse? (2 pts) 2. On this recording of a finger pulse, you cannot see mV the tops of the peaks because they were cut off at the range limit. a. Could you measure the amplitude of the peaks from this recording? (1 pt) b. Is there any way to recover the data without re-recording the finger pulse? (1 pt) c. What would you adjust and in what direction to re-record this and see the peaks? (2 pts). Time 3. Assume that you have opened the stimulator panel so that you can control when the stimulus occurs to the frog leg muscle that you are working with. The stimulator panel that comes up is below a) What is the amplitude of the stimulus in mV? b) What is the frequency at which pulses will be delivered when you click "stimulate? (1 pt) 1 pt) Stimulstor Documentl output: Puise Ssmulate Max Repeat Rate Puise Height Puse Width Hz 4. Choose from these four sampling rates to answer the following questions (1 pt each): 1000's, 100/s, 10/s, 1/s. Don't assume you need to use each frequency given! Which sampling rate provides the LEAST detailed information? Which sampling rate spreads the data out the most? At which sampling rate are you most likely to miss a quick event? a. b. c.

Explanation / Answer

1.

(a.) 1V = 103mV = 1000 mV

In 2.5 V = 2500 mV

(b.) There is no peak means that the transducer may be passive which mean it can produce the voltage by itself flat line at 0.0 V

(c.) The reasonable range to record a finger pulse is 200mV at the upper right

3.

(a.) The amplitude of stimuli will be 5000mV and the baseline value should be 0.0V

(b.) The frequency at which the pulse will be delivered is in Hz to 1.0Hz and the duration for the pulse to 10ms

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