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Introduction to the Nerve/Muscle Physiology Labs

Introduction to the Nerve/Muscle Physiology Labs. The digital oscilloscope, EMG, EKG. Outline. Importance of potentials in biology Recording of electric fields from surface of body: skeletal muscle Recordings of electric fields from surface of body: the heart The digital oscilloscope

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Introduction to the Nerve/Muscle Physiology Labs

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  1. Introduction to the Nerve/Muscle Physiology Labs The digital oscilloscope, EMG, EKG

  2. Outline Importance of potentials in biology Recording of electric fields from surface of body: skeletal muscle Recordings of electric fields from surface of body: the heart The digital oscilloscope a. Sampling b. Triggering

  3. Why should you be interested in electrical potentials in biology?

  4. Why should you be interested in electrical potentials in biology? They are present across the membranes of all cells and are necessary for maintenance of the internal fluid composition. They are the basis of nerve impulses that underlie the functioning of the brain and all our senses. They are the basis of the rhythm of the heart and the contraction of heart muscle as well as the contraction of skeletal muscle They are useful in clinical medicine for diagnosis.

  5. What is your experience? I have used an oscilloscope before I have had an emg or an ekg recorded from me Both of the above apply to me None of the above apply to me

  6. EMG Electromyogram

  7. EKG Electrokardiogram alternatively, ECG Electrocardiogram

  8. What is the heart rate? 10 beats per minute 20 beats per minute 60 beats per minute 120 beats per minute

  9. Systole is the period of time the heart is contractedWhat interval in the EKG corresponds to systole? P-P QRS-T P-QRS T-P P-T

  10. Diastole is the period of time the heart is relaxedWhat interval in the EKG corresponds to diastole? P-P QRS-T P-QRS T-P P-T

  11. Atrioventricular block

  12. The Digital OscilloscopeHas 2 Components An analog to digital converter (samples voltage at each tick of a clock) A computer to graph the values and to control the A-D converter

  13. What do we see if we sample a 1 kHz sine wave at 1 kHz? We would see nothing We would get a series of points that look like a straight line We would have each cycle of the sine wave represented by a 1000 points None of the above apply

  14. Stimulator Produces voltage pulses (stimuli or shocks) whose duration, rate, and amplitude can be controlled by the experimenter

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