BIOPAC Systems, Inc. BSL PRO Lesson H28 Reaction Report 4. Knee Jerk- with menta
ID: 3510352 • Letter: B
Question
BIOPAC Systems, Inc. BSL PRO Lesson H28 Reaction Report 4. Knee Jerk- with mental distraction 5. Flexor Withdrawal Reflex -pin prick 6. Voluntary Knee Jerk Reflex With Mental Flexor Voluntary Distraction Withdrawal Knee Jerk msec rial msec 43m16 2 43116 s 5 38 ms log 27 283 9s115 2. 9 10 Average 32 35113 How do reaction times vary when doing normal knee jerk, distracted knee jerk, and voluntary knee jerk? Why do we see these results? a) b) What is the significance of the flexor withdrawal reflex? Why would this affect knee jerk reaction times?Explanation / Answer
a) Diatracted knee jeek is also called as Jendrassic maeuver It increases the reaction time. The brain has the ability to control simple reflexes.
Normal knee jerk response proves that the sensory and motor connections between that muscle and the spinal cord are intact. The vigor of the response shows the degree of excitability of the spinal cord.
In voluntary knee jerks, the subject should again look away but this time voluntarily jerk the knee after hearing the hammer tap on a soft surface. The tester should minimize the effect of anticipation by not being predictable about when the hammer is tapped. It significantly increases reaction time.
b) Flexor withdrawal reflex: this withdrawal reflex is a spinal reflex intended to protect the body from damaging stimuli. It is a polysynaptic reflex, causing stimulation of sensory, association, and motor neurons.
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